I got my steps installed this weekend, once I finally got the right ones. Some idiot (he says, trying to look innocent) ordered crew cab instead of double cab, the first time around. However, once I straightened that out, they went on pretty well. They're eBay copies of the OEM rectangular ones, but I had them at my local Chevy shop, and they said they looked identical to them. The only difference they saw was that the factory ones come with the brackets attached to the rails apparently. Mine came in pieces, and I had to figure it out, with no instructions to help. The only real problem I had was that some of the little clips that go in the body holes didn't line up, so I couldn't get the bolts through. With a little bit of creative re-shaping of the clip, I was able to make it work (and I only lost one of them down into the body panel!).
I went back and forth over the "chrome" vs "black" debate, and I'm pretty happy with my decision. I probably would have been equally happy the other way though too.