Meh..if they were able to implement this system without faults, then maybe it wouldn't be so bad.
Since they aren't, I wished they would just have waited til 2.0.
It takes forever to really stop casting, and it also leads to casts not going off at all.

In Dzemael, the tank is not SUPPOSED to stop for the healer to cast anything, because otherwise mobs catch up and kill him in a matter of seconds. I'd have to be able to stop sooner as the tank to start casting and even if I'm able to start casting in time, after watching my skill gauge filling up and the HP of the tank rushing down, my character just bugs out and decides not to cast. Great.