I would say that one think to look for on a hard drive based player is if it has dedicated folder keys. the Iriver h340 is a good hard disc based player/recorder but is not supported by audible. You can get a remote for the old Ihp140 That has dedicated folder keys but the are not on the player. You can move from folder to folder one folder at a time but when you have so many folders you need to be able to jump many folders. I wonder if the RCA players have folder keys. My next player will surely have them.