I have a Alpine 7995. When you put the disc in it takes several seconds to read it and when you switch between songs there is about a 4 second gap instead of the usual 2.
Also, when you pause a song, and then unpause it, there is about a 2 second gap for it to start again, but only if you leave it paused for longer than 10 seconds or so. I have NO idea why! //content.invisioncic.com/y282845/emoticons/confused.gif.e820e0216602db4765798ac39d28caa9.gif
I have not noticed any difference in the sound quality from a normal cd.