I had good luck with the Kendas I have had on my bike. They were on a used wheelset I bought from a local bike co-op, and already quite well used. I got another couple thousand miles out of them before the rear started showing some threads in the sidewall (think it was from age and exposure more than anything). Just ordered some cheap Nashbar 35 mm city tires for my bike. Probably wouldn't have replaced the Kendas yet, but the Kendas are 40s and I wanted 35s or smaller for my new 45 mm fenders which I should have soon.