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As other reviewers have mentioned, the sound quality on the Q3 is very good. The menu system is not particularly good, but it does not make you run into circles either. The same button locks the device (so buttons will not respond to bumps) and turns the device off, which is the single most annoying part of the Q3's design.
The screen is small (about 1/3 - 1/4 that of a smartphone) so don't expect much in terms of watching video, there are some shows which lend themselves to this format (cartoons and talk shows) but most movies or anything involving action will be too pixelated to be enjoyable. While BBC iPlayer is supported, it is a pain to use because of the copyright protection. It may be worth doing if you are going on a long flight, but for commuting it is more trouble than it is worth.
The software Samsung provides for the Q3 is designed for their mobiles, and using it is more of a pain than plugging it into a computer and copying files as if the MP3 player were a standard USB flash drive. Fortunately its not too difficult copying podcasts from a PC to the Q3 which is particularly useful for commuters.
Battery life is good, my only problem being is that the battery indicator tends to overstate the amount of power you have left when you are below 25%, which if your forgetful as I am means you rarely charge before the battery has died completely.
While the Q3 is not going to kill off any Apple products, it has its pluses as an MP3 player provided you do not watch videos often. It is a reasonable middle-range option, but if you are going to watch videos regularly get something larger (and probably more expensive).
Not just an mp3 player the YP-Q3 also inlcudes a video player (iplayer compatible), voice recorder, fm radio and some simple apps. It's very cheap compared to an ipod but also has great audio quality and plays a range of formats including .flac. It comes in black or pink (which is a bit garish even for me) and is very compact.
Excellent sound quality.
One of the few mp3 players that also play flac.
Very good value.
Small / Compact
Comes with fm radio unlike ipod.
BBC Iplayer compatible.
Uses "soundalive" audio engine to compress audio files with out losing quality. This is especially useful if you intend to use flac files which can be massive.
Bundled headphones are pretty good.
Good Battery life.
Reasonable build quality.
Video screen so small it's a waste of time (2.2 in).
Small memory capacity (max 8 gb) meaning if you use flac files you won't fit much on (same goes for video).
Tacky appearance and ugly design. There's something very "mumish" about it.
Controls are cumbersome and sluggish. It's very easy to turn the thing off instead of locking it making using it on the move a bit of a pain.
All in all I would recommend this product to two very different groups - audiophiles on a budget and mums who want a cheap ipod alternative.
Everyone else I would advise saving up for a more grown up device.