Took me 2 days to get the flo up and running properly but after that, i havnt had any problems. Heck, i am even getting used to scrolling through songs (making folders helps a lot though).
Its sound is good, battery life is mediocre ( ~ 8 hours), has a 3.5" screen which according to me has decent sensitivity (comparable to the samsung corby's. Only the UI is a bit slow so it locks up sometimes if you try to go too fast), costs 6k (2gb one), has a line out and IMO has a decent build so i personally love it.
The reason i bought the flo was to just play songs and watch occasional movies. Thats it and i havnt been disappointed. If you want a better PMP then the fuze / D2+ are good bets (incidentally, even the D2+ has a decently powerful amp. Not as powerful as the flo but still can drive more cans/IEM's than the sansa's) since They have better UI's and more features.
But be ready to download loads of flac/320kbps mp3's since those IEM's and the flo will reveal flaws in 128/192kbps mp3's.