I have an R1 in my truck and an RS in my buggy. I just ran the buggy this past weekend with a Speedpassion 17.5. It was real good, no complaints. My friend had a laptop with the hotwire, and we made some adjustments with it and upped the timing. The truck usually gets a 10.5 or a mild modified and as long as I'm not overgeared, it's fine. With the R1 Pro, I can run more motor than anyone needs and not have a problem. The Redline sensorless motors are very nice and you won't notice any problem with them in offroad, even on starts. I have no direct experience with their sensored motors, however.