Yesterday got my Clip+ out of all 'sansa dream' (reading too many reviews) I added favorite FLACs from media monkey, started to listen, and horrified by the same 'FM' soundish, sound was grainy, also there was some dip and raise, not spacious, congested, low-fi sound...I felt I was spoiled by my old iAudio U2, Samsung Focus/iPhone 4 or desktop d2x, after hearing for few hours nothing changed (my ears got burned in!) then I tried Rockbox stable build, wow!!! world of difference, sound got spacious, grainy & dips disappeared...sound is full comparable with other source I mentioned, is it better?, I need to find out. On other things the size/weight of the player surprised me, it is so lightweight and super small! thankfully it sound good too now...Headphones tried: stock bud, brainwavz r1, Shure SE215, Shure SE535
Conclusion, definitely use Rockbox!