I've been using the Snuffer SS for a few years now, the 100 gr., and I have not been disappointed yet. I've shot a few elk with them and only once I didn't get a complete pass through, and on that one I went through the near shoulder and the broadhead was sticking out of the off shoulder.
The bull elk that I shot 3 years ago was 51 yards and the arrow passed completely through him.
I've never not gotten complete pass throughs on a whitetail, and I've shot a bunch of them with the Snuffer SS..
Magnus has made a couple subtle changes to the Snuffer SS recently. You can see a difference in the ferrule, but I'm not exaclty sure what the change did to better the design. They've also been working on getting the broadheads sharper out of the package too.