We have ~9k miles and 4 track days on our PSS and they're still good for probably another 8-9k and maybe 3-4 more track days.
I did however chunk them a bit on my first track day by not warming them up enough before trying to put power down out of the exits.
I wish I had something to compare them to, but I'll probably go with Mike's recommendation on the AD08R next time just to compare.
Here's after 4 track days