"Voice recorder" is too modest a description - This is a very good music recorder. Every musician should have one of these knocking around in their pocket at all times! It's well-made, sounds excellent, and - most importantly - it's tinier than a cellphone. It's not a Zoom H4N, but in one very important aspect, it's far superior: This is the recorder you'll always have with you when you need it.
I'm impressed by Sony's engineering cleverness. They thoroughly refined this design over the years, and it shows: It's a classic - the easiest recorder I've ever used. The pop-out USB seemed like a gimmick at first glance, but I find it surprisingly handy. In essence, it's a USB thumb drive with (good) stereo mics and a (crappy) speaker built in. Pop it into any computer, and a folder of mp3's or wavs smiles back at me. Also, it charges while plugged in, so I might never need to fuss with changing the single AAA (!) rechargeable battery.
Amazon's description contains a couple of errors: First, as I mentioned above, this runs on one AAA; not two. Second: It will not record a 320kbps mp3 - it only goes up to 192; but if that's a deal breaker, consider seeking help for your fetish. It will record uncompressed wav files (yes, with a .wav extension). Sony cluelessly calls it "LPCM" but don't worry.
I do wish it would record in 24 bits; it only does 16-bit. I also wish it had a lower mic sensitivity setting; I leave it in the "Low" setting at all times. "Medium" or "High" would really only be useful for lectures etc. In the "Low" setting, a loud band is still apt to trigger the (not very musical-sounding) analog limiter. So if you're a rocker who needs to record mostly band practices or shows, you might want to plunk down the extra $$ for a Zoom or Tascam. But for the money, you cannot go wrong with this one. Consider if you actually need the features of a bigger and more expensive recorder, because the relatively tiny size of this guy is without a doubt the most valuable feature of all.
I love love love it. I have it with me wherever I go. I'll never lose a musical idea again!