I've managed to convert Ady's Episode IV and V Color Corrected into MKV and they play beautifully on the WDTV player.
I can see why he's done his in AVCHD format seeing as most people would have either a PS3 or Blu-Ray player but to be honest the whole ISO burning process takes way too long + I want to be able to simply play the movie without having to insert a disc.
And hey, who's needs a AVCHD anyway when there are no menus to begin with??