I love my MR8, really love the draw, the valley feels wide enough that if you creep it doesn't pull your shoulder out of joint. Haven't shot the insanity yet, but I did draw one back at the local shop yesterday, to me it has a good sized hump right before full draw, and has a very narrow valley. I do really like the back wall on it though, very solid. I alsways like to have a bow that if I have to let down on an animal, I cant control it. My MR is very easy to control, as the Insanity definitely wants to jerk your arm on the let down. I always hear people say the MR series bows are so heavy, but the insanity is about the same weight, which I personally like. Go shot both of them, go with the one that feels the best, and you shoot the best.