I've done over 800 miles on my set of Power RS tires. I fitted them in the cold and wet winter, the first surprise was that despite their look, the tires worked well on damp roads, even when still scrubbing them in. I try not to ride in heavy rain, so can't comment on that, but I road on damp roads a lot and the compound finds grip somehow. Warm-up is very quick, they never feel wooden, where you have to just trust the tire and hope. They give a comfortable ride, they're very stable and make the bike feel nimble.
Enough about cold and wet behaviour, in the dry/warm conditions of spring these tires are wonderful - you will not run out of grip on the road. On my bike they do need 35/36 psi in the front and upper 30s in the rear, else they don't feel as good - I always experiment with pressures and set my suspension to suit, once done I absolutely loved these tires - nothing around, charge through some corners seemingly too fast, absolutely no drama, settled, tons of feedback, excellent.
So is there a down side to such a great tire ? well I was hoping for 3000 miles from the rear, but at 800 miles I'm a good 1/3 through I would say. My bike's lost a lot of weight, but the engine puts out 1290 super duke type torque now, so it does work them hard - I just sit on the bike !
Will I buy again ? bloody right I will, although they have brought out the Power 5 now, but I don't think it's any more sporty... maybe a few more miles out of them ?