[lincpimp]

Yep, the mm is a better bet on 4s than the quark. I have both and have used the quark with a variety of motors on 5s, which is hit or miss with the MM. In my experience the MM is a solid 4s controller that will stay cool if you add a larger cap on the power board where the battery leads go. Griffinru can mod a MM for you that will stay cool on a 7xl and high gearing, so I am sure it will work well with a lehner.