I'd also like to have Jim's email. I lost one from my set. Left it under a tree after dark I guess.
I've had a set for years and have found nothing I like better for really gnarly trees. I've started using the rapid rails because they are quicker but honestly, I think the rails are a bit of a pin to maneuver quietly while hanging off the side of the tree. The Stepps can be handled and installed completely in front of your face or chest while standing comfortably on two feet at the same level.
The other big plus about them is the color. there isn't another step, ladder or rail made that blends in better on the tree.
Here's a typical setup photo. Notice the lack of black web straps. I HATE THOSE THINGS!