As I said earlier, I do recognize a difference going higher than the 128k standard, but it isn't that large nor important on the majority of songs. For my favorites, I will rip them in 160, but I wasn't sure that the 919 was going to play them. It WILL play 160s. I haven't tried any higher.
As far as the 919, I think it's an AWESOME cd player, that can play mp3's. The interface DOES SUCK. No fast forward or rewind exists for mp3's; only track skipping and directory changing. It is slow but bearable (about 5 secs) between songs. The song naming (no ID3 tag support) and directory structuring must be carefully done when making the disc. That is to be expected though. No Joliet support, but it does support 27.3 file names. With all this said though, it's a first generation product, and the best one out there (Aiwa really doesn't even compare).
I would give it 4 out of 5 stars for the Cd player, features (crossover built in), display quality, functionality, and sound quality. I would give it 2-3 stars for the Mp3 support and interface. Overall, it is a solid 3 stars unless you're really wanting to play tons of mp3's. I wouldn't have bought it if I didn't get it at cost (a friend in the business). No way would I pay the $700 Crutchfield and CC wants for it. If you have the money to burn, or you can get it sub $500; go for it. If not, wait til next year. At least 3 more units will be released (alpine, kenwood, sony). All should be cheaper than the $700 that the 919 is.