We run with a couple of them. Aside from a race gas turbo, VERY few sleds compare.
Be sure to talk to Kelsey about which pipe to go with, there are a few that don't work with those porting specs. With the right combo though, it's an amazing setup.
I get confused on the high compression head m1000 ported motor. One engine builder would not go over 12.5 to 1 @ 6000' sayes if you use higher compression you will loose power in the long pulls others builders say its the best mod to complement the porting.