So far, the new Windows Phone sync has worked the best for me.... (which doesn't say much) When I use WMP, the phone is terribly laggy at loading music (from sd card) When I use this new sync tool, the phone doesn't lag, but if I simply want to add one album, it HAS to replace Everything!!! Which, in my case, with 20 gbs of music, isn't no quick task!!! I seriously would rather use an updated Zune to sync music and to categorize videos. (that's another feature that I can't figure out why they would remove....)