Anyone use these

I have done some searching and don't see a lot of post on Rear Disk Brakes. I saw these http://www.ebay.com/itm/chrysler-8-...404&pid=100016&prg=1006&rk=1&sd=230575563732& on Ebay and was wondering if anyone had any experience with the product or the E-store that sells them. They are 85 ELDORADO CALIPERS & pads and 79 Trans AM rotors. I think an additional $79 gets them slotted and drilled. Seems to be around $100 cheaper than Summit and they come with the E-Brake cable's. Just thinking I might go to Disk when I rebuild the brakes on the 67 Dart.