I've been using Rocky Mountain 3 Blades since they came on the market in the mid 70s. I was going to try Rocky Mountain mechanical but have been in 3 different Bowhunting camps where a hunter OR hunters have had a problem of some sort with them-various heads. Lost game with apparently a good hit & not a pass through, not good penetration.
I just decided it was not worth a chance. I nearly always shoot through my animals & thats what I prefer.
I also like to travel to Tx or Ok. on a couple trips in the off season to Bowhunt Wild Hogs & the places I go do not allow mechanicals. They just say, to much lost game.
I'm not saying their not good-I see plenty of animals shot with them on TV & I've seen several animals taken by other hunters.