My Monster has been abused and is still going strong. It's sitting in a ~16 pound truck currently geared for about 50 MPH on 4s lipo with Losi 420 wheels/tires. The fan comes on quite a bit but it's a trooper! I bought a new pinion to stress my setup less, but the MMM is solid as far as I'm concerned. I'm most-likely buying another one in a few months for another 1/8th scale conversion and maybe another one after that to replace my aging MGM (burned up the BEC last time I ran it
).