I'm on my third set of M1s. I get about 6000mi out of each. It's a good middle-of-the-road tire, in the sense that it has good wet traction, pretty sticky in the dry, warms up pretty quickly, and good wear for a sport tire.
I'm a Metzler #####, however. I've been using nothing but Metzlers or Pirellis (for the KTM) for a while. Didn't know about the "P" designation, however -- have to see if mine have that.
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