I do about 50 on average, and always start slow. Maybe that is just the way they are. I will update this thread every time I add 1,000 miles just so people will know.
If they wear out at 15,000 I would say these are even more expensive than I thought! But they are the only ones I can use on my 17.5 x 8 rims.
I might get some steel 17' wheels and put some radials on them and switch out the STA's for car shows and 4 wheelin. Just need to find some room in the garage and money in my wallet!