I was kind of curious about them as well. I put a post up on their message board, not a lot of help though. There was a bit of a write up on the turnigy 540 size inrunners not being to impressive, which has got me kind of leary about these as well, but thats about it.
I have the 36-50-6S and to be honest, it's a beast. I thought it was 2900Kv, but when I ran it in my MBX5T, I noticed it was just sucking a lot of AMPs. Thant I found out it was a 5900Kv motor. First thing you have to do is to some how add screws or use high strength/temp epoxy to keep the front end from coming loose or you can use Mike's heat sink which will hold the motor together. You can see in the picture, the motor is more like 56mm long than 50mm stated my KD.