A few weeks ago I bought a 60D body from them on ebay as the price was the lowest I had seen around and their seller rating was excellent. They shipped very quickly. It was when I received it that I discovered it was grey market. It was missing the normal Canon documentation and CD software and the instruction manual was not genuine. It almost looked like a copy of the real thing. Everything else was genuine (battery, charger, strap, cables). It also came in a kit box but just included the camera body so it looks like they were removing the kit lenses and selling the bodies. I was still ok with all of that but when I turned the camera on and tried to shot, it had the err 30 issue. Since I had no USA warranty I knew I was screwed so I called them up and they issued a RMA # and sent me a prepaid shipping label. Once it was returned it was about 3 days before I got a credit for the return.
In looking at a few of their other listings, it appears that the non-grey market item will specifically state "USA Warranty" in the listing. My listing did not state this. It seems like if you are willing to take a gamble on the low prices they are worth the risk as their customer service was great in my dealing with them.