interface niggles are my biggest complaint (the fact that i'm accustomed to powerdvd is no doubt a part of this now), but i have had an update-requirement showstopper situation and i didn't like their processes regarding patches.
http://www.cyberlink.com/multi/downl...hes_1_ENU.html is nice and clean - no login for the downloads, it's very clear which patches are for which builds, etc. dvd playback is fairly far from rocket science in terms of stability/compatibility now, so that should be de-emphasized as a REQUIREMENT, but it's certainly nice to know that you can get clean updates easily if the need arises.