http://www.renntech.org/forums/index.php?showtopic=4265&hl=Sumitomo
I did not remember how many miles I got on the first set. But I found the above message from May 2005 when I put on the second set. I got 20,000 miles on the first set. If you look at the pictures you can see the patched left rear tire that went 20,000 miles on the patch.
So far I have 10,000 miles on the second set that were put on in May 2005, so they are barely broken in.....
Some of the other local Boxster owners also have Sumis. Not the best tire in the world, it has been said, but you cannot beat the value.