This motor is very strong down low and has good top. Other 28's ive experienced did not have the top I was looking for. I got 7 minutes during my race, sounded like the motor was ready to lean out when I came in though so 7 minutes max with a 53 pipe. But it was also not tuned out optimally (temped 200 probably could lean out a little more). It will clear a long double at my local track practically from standstill at the beginning of the double compared to having to build up speed with a 21 which I feel is a plus because if you get into traffic prior to that double you still have the motor to clear it where other have to roll.
Longevity, well I'll get to that later as I run it more.
I'm running it in a Kyosho St-r.