Anyone shooting these bullets yet? In any caliber and if so what are your opinions of them.

Yep, I use them in my 450 Dakota (the 450 grain version). They shoot great and shoot to the same POI at 100 yards as the 450 grain TSX bullets. I shot a 2000 pound bull bison with these in early January because head/neck shots were strongly recommended and I didn't want to damage the hide as much as the TSX bullets might have. 1 bullet in the neck dropped him like a rock, but it still required a finishing shot. There is another thread here in the big bores section about these bullets.