I have a set (both front and rear) Carbotech Panther Plus Brake Pads that I used for 1 track day (Thunderhill). I'll have to admit I didn't wear them down much at all - there is 10mm of pad material on the fronts (don't know how much came when new). Retail is $258, asking $200.
These are great pads for street and track days without having to change pads. You will be amazed how big a difference better pads will do for your braking! I am selling because I now have Stoptech brakes. These pads are direct replacements for the stock pads and is very easy to change yourself.