So, update.. my back rollers arrived from the eBay seller yesterday. A few scuffs cleaned right up with a rag. They look great. Mounting is a hassle due to the nonstandard adapters I must use. Another minor disappointment, they appear to be QL1 not the advertised QL2.1. But now that they're on, I can see why people swear by them. Definitely quality. And the straps and attachments are well designed.

On the down side, they are a bit smaller than the Kona panniers. The Konas are extremely wide, taking advantage of the extended wheelbase. No heel strike issues, ever. I used the Konas like one would use a car trunk. The panniers stay on the bike always and I place my backpack, grocery bags, etc. in the panniers, then take them out at my destination. Can't do that as easily with the back rollers. My backpack won't fit, although my son's pack fits just fine. I don't see myself taking the back rollers on and off the bike all the time. I may just have to get myself a smaller pack that fits in the back rollers and use that instead.