Sure did. I used the EBC organic pads. Actually, I knew they were EBC, but I didn't realize they were the organic ones until I reviewed my order history on bikebandit.com. But yes, I am using them on my rear brake and they are no better or worse than my other ones.
I think performance wise, it would be easier to detect poor brake pad quality in the front pads since those endure harder braking, but I have about 3K on the rear pads and they seem just fine.
jesse