Shot a 200+ pound buck some 5 years back with a 3 bladed Rage. Made a complete pass thru with no trouble, but only two of the blades opened. Luckily found the buck with no blood trail.
I've always been a believer in fixed blade broadheads and that is all I used with my compound bows.
I only went to mechanical heads when I started using my crossbow. I chose the Rage heads and that is what I've stayed with. The two bladed I haven't had any problems so far, and thats been about three years now.