The Tektro rt354ag are hands down the best mountain levers I have ever used. The ergonomics and adjust-ability are great along with being able to use v brakes or cantis. I use v brakes on my nashbar touring with a deore up front and bottom of the line shimano in the rear. I have no problem stopping. I am 205lbs, I do fully loaded shopping runs with loaded panniers front and back, and pulling my daughter in a trailer behind me. So all together about 330-345lbs and I stop well from up to about 23mph regularly. The caveat is that I live in florida, so no 40mph downhill crazyness.