The Coby MP-705 weighs 57 grams. For comparison my Samsung T10 weighs 44 grams and my iPod Nano weighs 36 grams. All three players are roughly the same length and width, and sport 2" (diagonal) LCD screens. The Coby is the thickest of the three at .37 inches (almost 3/8"). The T10 is .31 inches thick, and the Nano is .24 inches thick (less than 1/4"). 
A 4gb Coby MP-705 costs $53 at Amazon.com. The 4GB Samsung T10 is $80 at Amazon. You can't buy the new Nano in a 4GB model, but last year's version with 4GB can be found for $114 at Amazon. To put this in perspective, the Coby sells for less than half the price of an iPod Nano. Lets see how it stacks up against the competition.
The bottom edge of the player is where you'll find the Mini USB port and headphone jack. There is a reset hole on the back.
The top edge has the On-Off Power/Hold slider.
All controls are on the front face, and are back lit touch sensitive. You'll find a Menu button, Options button, and a direction array with OK in the center. The silver ring you see is simply decoration.
The MP-705 is not huge. Only 3.75" long. You can see it here with my glasses and watch. The back is a polished aluminum. The front is a glossy black plastic. Both are fingerprint magnets.Video. As I said, all three players have a 2" screen. The Coby cheats a little with only 220 x 176 resolution while the T10 and Nano have 320 x 240. With less than half the resolution, video playback on the Coby is unimpressive. There is only one menu option: brightness. Nice enough. Next/Prev and volume controls rotate while watching videos in landscape orientation. I can't give video play on the Coby MP-705 any better than a (C+). Yes, you can play videos on it. IMO it's not worth doing.
Music. The Coby will play MP3, WMA, and OGG audio formats.
The Nano will play AAC, MP3, Audible, Apple Lossless, AIFF, and WAV.
The T10 will play MP3 and WMA. Cover art in the music app is small, with no option to display it full screen. You can access the equalizer, play settings, and mark a song as "favorite" all within the music options menu. Sound quality is good, although not with the included earbuds. If you have associated lyric files with your songs, you can also turn lyric display on or off. Music will play even after leaving the Music App. But one serious flaw is that outside of the music app you have NO volume control. I'll give the Music app an (A-), for small cover art and this volume control flaw.
Photos. The Coby will display .JPG and .GIF files. The Nano will display .JPG files. The T10 display .JPG files. Again the low resolution screen looses this comparison. The lack of resolution in the Coby is very obvious when comparing the same photo on all players. Control over photos is very thorough, if clumsy. A long press of the center button will bring up pixel size, file size, and date of the current photo. Press the down button to rotate pictures in 90 degree clockwise steps. Within the options menu you can zoom in or out, change brightness, start a slideshow or set the show timer, or rotate an image. Zoom is very impressive, with no apparent limit on how much you can zoom in on a photo. I could zoom down to see individual pixels of a 768x960 photo, although each zoom step required 6 button presses. Coby seriously needs to simplify access to zoom in this photo app. Still, this zoom feature has more potential than on any other player I've tried. Photo gets an (B+), for the low resolution screen and inefficient access to the Zoom control.
FM Radio. FM radio reception and performance is adequate on this Coby. Like all other players the headphone cable serves as antenna, so reception varies with position, length, and shielding of that cable. Your reception will also depend on where you live and the strength of stations near you. The MP-705 allows manual tuning, Auto scanning, adding and deleting of presets. I could not tell what limit there might be on the number of FM preset channels. Coby is a bit stingy with specs for this player. FM play will stop if you back out of the Radio application. No listening to the radio while you peruse your pictures. Accessing preset channels is a little confusing. If you've just done an autoscan the FM player will remain in "Preset" mode allowing you to move right and left through preset channels. Yet if you leave the player then re-enter it, you can only access preset channels through the options menu. There doesn't appear any way to toggle preset or manual tuning. I'll give the Coby MP-705 FM Radio App a (B+).
Text. While the Coby does let you read .TXT files you can store on it, the low resolution again inhibits the value of this feature. There is only one font. Legible. You can scroll up and down within a document, or page right and left through a screen's worth at a time if you wish. A nice feature is Auto-Page, where the Coby automatically advances to the next page after a preset amount of time. You can change this amount of time from 3 to 15 seconds. You can also set one or more bookmark within text files. A tap on the options button will tag a location. Unfortunately it takes a longer touch of the same button to recall and goto or delete saved bookmarks. I found it too easy to accidently set a tag. The eBook reader on the Coby gets a (B).
User Interface. You manuever through the MP-705's main applications by tapping left or right direction buttons. The graphics used are uninspiring, but adequate. The current time and play status is shown at the top of the screen. You'll see a postition marker at the bottom of the screen, indicating where relatively among the 7 apps you are. The touch controls are sensitive enough. Their backlight turns off very quickly, no doubt to save battery life. The buttons still respond with the backlight off, so it's not a functional problem, yet I am bothered by this "invisible" nature of the Coby's controls. I suspect I'll get used to it though.
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Value? With touch controls and a sleek design the Coby MP-705 appears to be more expensive than it is. The reality of it's features brings the low price into perspective. Coby saved costs on the screen, UI development, extent of features, and online support. Of all my players that came with 4gb memory including the T10, Zen, Hip Street, Sylvania, and a few others cost more. Many had add-on memory slots. Most had mics with voice recording. One even had a camera. Yet if you don't need those features then the Coby MP-704 will do fine, and is priced appropriately for what it does. A better value than the iPod Nano although not as thin or stylish.
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Overall grade? (B+).
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4D

The bottom edge has a small reset hole. I've read that you can also reset a locked up Zen by holding down the power slider for 15 seconds or so.



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To start with, although I had ordered a black one, I was afraid I'd gotten a white one when I saw the box. ;-)



The 901 came well-packaged. Inside the box I found:




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You get the same size screen as the 
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Also included was a charging cable, earbuds, earbud covers, and three pieces of paper. There was a Quick Start Guide, a Registration notice, and a warning about actual memory space on the T10.
The front face is split with a 320 x 240 pixel 2" LCD on the top half, and the lower half occupied by a touch sensitive control area. There are dedicated spots for Menu, Back, up/down volume, left/right file browsing, and a center Play/Pause/Select button. All are backlit.
The YP-T10 is 3.78" long by 1.63" wide and only .31" thick. It's about the same length and width as the iPod Nano and small Zune. It's smaller and thinner than the Samsung P2.
