I haven't used X2 much since I installed a couple of weeks ago (including the build 308 quickfix) because of other priorities but in that time the rate of incidences of crashing seems high compared to X1.
For example I spent most of this morning trying to clean up a very old domestic reel-to-reel recording of a conversation, notching out frequencies and trying to get rid of noises on an individual basis. All I did was click on the automation dropdown in the lane view and X2 decides to fall over. All gone.
An annoying part of these crashes is every time it does this I have to restart the PC to re-open X2 and the project I was working on disappears from the recent files lists. Today I lost a load of minute changes. Not happy.