Good, but consider the source.

BitPerfect does a good job of ensuring my DACs are configured to run at the same rate as the playing audio file. This does help improve the sound quality--more with some DACs than others as some do really good conversion/upsampling on their own. That alone is worth the price for me.

I have reasonable speakers, a good amplifier, and good DACs. I can hear a difference with some source material. At the very least, it sounds a db or 2 louder and a tiny bit cleaner across the entire range--and some pretty gnarly alising vanishes from one of my DACS. The difference is more pronounced with better quality files, and I know this. I use another dedicated tool to play FLAC files and just do 128k VBR MP3 files in iTunes (for the iPod). That means that bitperfect is improving the sound of a really degraded source... there isnt anything there to improve. But at this price, why worry?

As with anything audiophile, there is a point of diminishing returns and you have to think in terms of your entire system. If you cant hear (or, rather, dont know how to hear) the difference between a 128k and a 320k MP3, this wont help you much. If youve got cheap PC speakers, this probably wont help much. If youve got a good rig and are listening to higher-quaility files, it will probably help. If you are into computer audio, then you will probably notice the difference (you will know how to listen and what to listen for).

I like it, Ive been using it for a long time. I think it is a good tool for $10. But you have to know what it does and what it cannot do. Dont expect magic if all your hardware is inexpensive, no software can fix bad hardware.

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