I had the YHM and dropped them in favor of the MI. They are both okay, but the MI is made better and is to spec with the rails. I also didn't like the way the YHM split the reail down the middle.

Both will mount fine, and you can hang lots of stuff on them. But I'm sold on the MI. I have a review up on Colorado Shooting if you go look at it. The review is the rifle length, but I have used both the rifle length and the carbine length. USMC03 has a review of the mdilength up there on his page.