Stage? With the multiple pulley options and additional parts it can be anywhere from the basic kit up to over 500rwhp. I have it on the stock short block so I kept it at 500rwhp, but could have gone more by using a smaller sc'er pulley (which comes with the kit).
The kit has approximately 15k miles. There would be no reason for any wear at such low miles. it is still installed on my car so I can't get pictures of the rotors, but if memory serves me right you can't see them from the bottom without some disassembly of the unit.
I have not been to the track since before installing.
I have never heard a person complain about the E-Force. We installed a few at the shop. They are extremely well designed s/c's. Easy, easy, easy to make 450-500 rwhp with this TVS unit. I would love to have it.