I haven't used it, but I was at a tractor pull a few years back where it was one of the sponsors, and was used by some of the competitors and they said it really kept their pull tractors in top shape.
They also used it in their trucks, farm equipment, and cars and said it kept their vehicles in excellent condition. It's due to the oil being highly paraffinic, which lubricates better. PAO is actually classed as a paraffin type of lube, so these oils might be as good as that.
Here's some info I found:
http://www.cen-pe-co.com/