I've a Mtroniks beast for 4 months and I'm very pleased with it. I bought it for it's waterproofness and field setting card and didn't have much expectations but it has suprised me. It's way smoother than my MMM and I don't have any heat issues on 4s Lipo.
I use it on a hyper 8 pro buggy with a medusa 36/70/2000.