I've been riding them this season, they have an ultra low swing weight, can rip like crazy on the groomed stuff and certainly kick major amounts of ass in the pipe and on jumps. I have only taken them on a few rails, but they were great.
I just got a pair of T-Halls last week and had them centermounted, I took a few runs with them at Breck and wasn't insanely stoked... Then again, I haven't ridden a center mounted ski since the line 1260. And we all know how long ago those were out.
I'm going to ride the crap out of the t-hall this weekend in Aspen.