I've been using them since they first came out and think they are great. You just need the right barrel and the horsepower to put them downrange. I've killed several head of game with them and all were with very satisfactory results.
I've shot some of the new Wildcats and they gave the same results and I just received a bucket of the 200 grainers and plan on continuing shooting them. The downrange results will put a smile on your face.
I've tried them in a 1:10 barrel and they wouldn't stabilize and beyond 200 yards or so they just didn't like the barrel.
I've shot them in a 1:7 and they worked find and now shoot them in a 1:8.5 and they are great.
Good luck and I'm sure you'll like them.