I bought a Nomad Jukebox 3 about a week ago and only have one gripe about it. Can you use winamp (M3U) playlists in the Jukebox or not. If you select import and have supported media open, playlists are avaliable but if I click on mine nothing happens.
As far as I know the Notmad alternative upload software does support Winamp playlists but I think Playcentre is perfectly acceptable for creating fast playlists.
Although I have had my fair share of connection problems with the Nomad 3 - these have applied equally to Playcentre and Notmad. I would not particularly recommend Notmad over Playcentre unless you are having real problems - I certainly don't think it would be worth it just for the Winamp support.
All said and done though - the Nomad Jukebox 3 totally rocks! Absolutely the best HD MP3 player out there for features and sound quality - and it's more portable than it looks.