The biggest reason I am sticking with the R1concepts stuff has as much to do with affordability as with how they wear. I installed their premium drilled and slotted rotors on my Duramax after my Christmas tree hauling season two years ago. Not only were they the only rotors and pads that EVER survived the next hauling season, I have another 25K miles on them on top of that. I have included a few pics below to bring this into perspective.
A couple of examples of the loads I have hauled with my 3/4 ton Duramax.
This is what the truck use to look like after a 10-15 day hauling season.
This picture is of what the rotors looked like after one last hauling season and two more years and about 25K miles of use.
I'll get pics tomorrow of the Eline series rotors I installed on the Yukon a few months ago, they still look great.
Also, R1concepts has calipers as well and as always, all orders over $99 ship free!