I've been using the Powers since they were released in Oz and love them. Am on my 5 th set now and wouldn't use anything else. Awesome grip in both the dry and especially the wet.
I get between 9,000-10,000kms from a front and between 6,000-7,000kms from a rear with my lard arse aboard. That's 100 odd kgs (220lbs for you guys).
I've been playing with lower pressures on my last set (32f/36r) and they perform even better at these pressures except wear has accelerated about 20% or so.