Alegria
I've become quite attached to my X1D Expanded over the last year..., and don't intend on moving on to X2 just yet. I jumped on board the X1 train at version C, so if that's any indication, it will be a few major patches before I do move to X2. But I'm itching...
Don't wait too long... While there do seem to be a couple of wrinkles to iron out here and there, I would say that X2 is basically X1D Expanded with some wicked new features (lanes, pc fx chains), some big improvements to existing stuff (matrix, the LP plugins) and a whole slew of really nice interface refinements (autozoom and timeline zoom), plus the extra candy (console emu, breverb, th2, R-mix), and on the whole very nearly as stable out of the gate. It's really hard not to say you're missing out by holding out...