Hey there, I have this player, I also bought it from Tinydeal. Just thought I'd give you (and anyone else interested) my opinion. I have bought several of these generic mp4 players over the last couple of months trying to find one I really like. So far this is one of my favorites. It's got a very solid feel for one thing. Many of these players feel hollow and cheap. The sound quality is very good and I've had no problems with the miniSD slot. I have used a few different 2gb microSD cards in it with an adapter with no problems. Battery life also seems good, but I don't run it for hours at a time. I'll listen while I'm going to sleep and set the auto power off time to one hour. Video playback I havent used on this one, but the screen is sharp and bright so I imagine it looks good.
My big problem with this player is that the button layout could be much better. Basically, for most of your navigation, you have one button in each corner like you can see in the picture, plus the round black button which handles different functions depending on the screen that youre in. None of it makes much sense. When you're navigating folder menus you have to press 'esc' to select the folder. The round button, which you would think would select, actually backs you out. Other menus, it's just the opposite! If this isn't a big deal to you, its an excellent MP3 player for the money. Personally, I'm going to keep looking for a similar player with more intuitive navigation. Hope this helps!