I am not an expert on mp3 players. I have own an Iriver 799. Purchased over the 899 because I wanted silver over red. Tech support at Iriver said the 1GB flash was the same in both and both were the same price at the time I bought. The Iriver music manager would not transfer music to the 799 that was protected. I run windows xp and media player 10 and it would transfer files to the 799. When I would listen to the 799 I could hear a tic like a skip in the playback. Irivier said because I recorded using the 192 bit rate that they believe that was causing the problem. They were aware of it and were working on a firmware fix. I did not want to wait for the fix so I returned it. I then purchased an Iaudio G3- 1GB from Jetaudio. When it finally came I found it to be much easier to navigate. I also use MediaPlayer to load it. After having it for 6 or 7 weeks and never dropping it or abusing it it just quit working. Iaudio has the worst tech support I have ever encountered. For that reason alone I would shy away from them. I know nothing about the MuVo but I think I will check them out. Hope that helps?