I got almost 20000 miles out of my original Metzelers, and they performed great as far as I am concerned. I saw no reason to change. I put the same back on, except I bought the front Lasertec instead of the discontinued Laser. The Lasertec has a different structure and rubber compound for a claimed better performance, but I can't see any difference.
I was really impressed with the Metzelers the first month that I had my Speedmaster. I was caught in a downpour just before entering a stretch of interstate in St Paul called Spaghetti Junction. The road was drenched and puddled in spots. The tires felt true and stable in the wet corners and I never felt like I was out of control. That one incident sold me on the Metzelers. Then when I was able to run them almost 20k, well like I said, why change?
Cody