I've had my K2 for a relatively short time and I can say that I am very happy with it. Along with it, I bought the neoprene case because it zips it completely shut. Some people want a case that stays on the device when they read it, I chose the complete closure over that. I actually slip the K in and out of it but I'm ALWAYS careful with my electronic devices. I just happen to like the feel of holding it unencumbered. The neoprene case is padded so I feel pretty safe throwing in a purse, bag or whatever. I can also lay it around and feel relatively secure in its safety. As for content, I download mostly from Amazon so I can't say about that but I also have audio books on it from Audible.com and they sound pretty darn good. I don't think I'll be putting MP3s on there as i don't see the point of it. I can't listen to music while I read - my old feable brain just can't multi-task to that extent.