After MTW 1.0, there are major patches:
MTW 1.1 quickly followed
then MTW/VI 2.0
then MTW/VI 2.01

MTW1.0 has a lot of bugs
MTW1.1 made cav more powerful, making MP imbalanced. There are several exploits in MTW 1.0 and 1.1 that MTW/VI fixed: the "swipe".