I've one of his old ones. It's good,.. but the brush spinning is a downside. Also, because it's tapered, I find sections occasionally stick and are extremely hard to retract.
It does make the work VERY fast and easy though.
There is a DIY option that is very similar too, and which I've built and use daily. (Ask Matt)
He was working on an aluminium non-tapered pole with shaped sections to prevent spinning last time I talked to him. If this new model is on sale, I want one NOW!!