Maxamps sucks.
Thats my opinion wanna see me whoop some ass on 18months old orion batteries ?
I use smc lipo's too i love those. the best. I have no idea about their longevity though yet.
I am a 1/10th scale off road racer and i use a 10.5 mostly/7.5 for big tracks in 2wd and 2 7.5's in truck and 4wd.