Anyone use Porterfield R4S pads?

I was set on ordering a set of EBC Greenstuff pads, but I've heard that they dont net much of an improvement....

A buddy of mine recently put a set of Porterfield R4S pads on his car and the improvement was amazing for just pads.

Anyone run these pads or know where I can buy them the cheapest?

Thanks

You can give them a call (1-800-537-6842) www.porterfield-brakes.com. I payed around $160 for a front set to go along with my big brakes. They are "carbon kevlar".

porterfield enterprises - located in costa mesa, CA
i have used these pads in the past and can say they work very well.
sorry i dont have the phone number at the moment.

I was actually looking for opinions of how they compare to, say, Hawk Pads...