I've had both M1s and the powers. I actually think they are very similar in a lot of ways and then complete polar opposites in others.
M1's - Heat up fast, do inspire confidence but for me they did not last very long before there was a very noticable flat spot down the center. I did a lot of commuting when I had those tires but it was mostly back roads so not really a lot of highway miles. I'd say I got 2k miles on them
Now I'll admit I took them off before the wear bars but the flat spot was pretty bad to the point that when you did bank it over, you could feel it, which causes wholes to be chewed in the seat
As for driving, they really didnt change the handling of the bike over the 208 and stockers I had previously. Just good traction where the others would spin.
Powers - I almost dropped the bike in the parking lot when I picked it up! These things are very curved into almost a point when they are new. It totally changed the handling of my bike, not to a 600 but it was much much more nimble. The riding into turns was a dream and I had to catch myself several times in the mountains from pushing it too far over. I have not felt these spin at all and actually have pulled the front tire up more than with any other tire (assuming from traction). I have almost 4k miles on them now and they are developing a little flat spot down the middle but they still have plenty of time left on them. I'll probably aim for replacing them just before the bash in April and then be good til later in the year.
Never tried the Diablos, heard good things about them though.
I guess it all depends on your riding style really. If you are more of the daily driver, M1s or maybe the Avons. If you like to carve up the roads, Powers (or Diablos) are the only way to go.
As for driving, they really didnt change the handling of the bike over the 208 and stockers I had previously. Just good traction where the others would spin.
