I have a Tungsten T3 and I'm using Missing Sync.

PocketTunes Delux works great. I have had zero problems. The playlist features, different views, EQ, bookmarks, etc. are all great features. The book marks are good for listing to books, and the playlists for listening to music.

I also use it for listening to language material from my Chinese classes, and there is a feature missing that would be very helpful. It doesn't have "repeat 1", it only has "repeat All". So you can't repeat a song that is within a playlist. It only repeats what ever is opened (playlist, a singlle song). You have to open that song separately and then have it repeat. The other (few) MP3 Palm players don't do this either.

Other than that, this app has served me well.