Well I thought I would share my experience with these tyres.
I had done 7,300 kms on the K3's and the rear was at it's limit.
I did a few reviews looking at the Diablo II and others but the review of the M5 Sportec gave me a lot of good feelings about this tyre.
See here :
Metzeler Sportec M5 Review
Anyway, I wanted a tyre that would last longer than the K3's as I ride the bike everyday, any weather and let's face it, the K3's are Track Day tyres as specified in Metzler's blurb.
So I fitted the new M5's last Thursday, scrubbed them in for 100kms and went out for a ride yesterday on a un-seasonably warm day out of Melbourne into the country.
Wow, I am sooooooo impressed with these tyres. The grip is fantastic in the dry, after the flat spot on the K3 it's like getting the S1000 from the shop again from new.
It'll be raining later this week so I'll try them in the wet as well, but as you can see from the review it's looking good.