I'll throw a spanner in the works here.
I tried them for 20k on my GSPD. The rears wore out quite quickly (circa 5K) but the front lasted 20k. I didn't like them at all, they never gripped too well and were appalling in the rain. The final straw for me was when the front washed out during heavy braking dumping me on the road. Plenty of people like them though. If you're happy to pootle along I dare say you wont have any issues but if you want grip on your bike on tarmac then they wont hold up. I also had an issue with a rear coming off the rim when it was punctured so there was an issue with the bead on that tyre.