This is the first I've heard about x2, I have x1 and don't use it much
anymore. I use another CAD system which is much quicker for me.
As for x2, it seems to me that they should have fixed the bugs that
have plagued Chief for years before trying to roll out another version.

Stairs need to be editable and show rails in plan view for one, the
cad tools need to be more user-friendly and not make the system crash;
and different wall types need to be able to join at the corners
without making some arbitrary "45 degree" joint. Lunacy and
unprofessional. I still use 10 on occasion to do renderings if the
house isn't too complex and trim-laden, so I haven't really looked at
x1 much. I hate the buttons and their appearance in x1, they were
cartoonish in 10, but x1 is ridiculous. That said, I've had very good
luck with Chief support being friendly (except for one person), and
they have always tried to fix the issues. But for that much money,
there shouldn't BE that many issues.