(mswerd)
im so tired of hearing crap about how the stock tires suck. guess what?!?! they are v-rated performance tires which means they wont last as long as all season tires people. especially if you often partake in 'spirited' driving. i have 32K miles on my stock tires. this is my 3rd winter with them and i have had no problems (knock on wood) and i still have some good life left in them. i think they will last to 40K easily.
this leads me to believe that people are driving a bit crazier then they are leading on. if you go through them in 15K miles, you seriously need to evaluate your driving habits.