I've got some information About R1 from a french forum. It's that R1 work really well if you use there motors (sound logical ...) , There setup is a lot torque based, on 1/10 th scale you need to gear like x1.5 taller than other brand (novak/lrp). Some problem of overheating have been report when used with lrp 4.5.
http://www.petitrc.com/_forumphp//sh...t=33889&page=3
I will give you my point on there motor soon, I want to try one with my MM