i was actullay about to start a thread on this lol and saw urs.
here are my converting experiences so far to share, hopefully more to add as we go on and may help others.
(free) itune sync
so far i havent come across any good free solution that will let you sync with itune to an adequate level.. >.<. maybe some of the paid app can do but that'll be later.
the generic music sync (HTC SYNC) is actually ok as it let you sync your itune playlist. music quality is fine and the interface is pleasant.
Of course, if you cares about your music then you'll feel like some elements are missing. preliminary things for me that were important such as matching song & album art & rating (stars) sync are either mismatching or not available.
initially i resorted to other (free) music players and apps and the closest thing was Double Twist, but its still buggy and requires installation of pc program itself.
So in the end i went back to generic music player, but instead of using sync i just drag my music files to my storage/music folder manually as HTC sync wont make a different in this case for my needs.
at the moment i m still researching solutions for this and will update again later.
fyi, the following are the list of the apps that i tried, so you may think twice before you install them:
-mixzing (good for video stuff tho)
-poweramp (best alternative music player (not itune sync stuff tho), but needs pay version for more functions)
hopefully look into:
or maybe ppl whos got them can give advice.