I've owned and used five of them, two of the original and three of the later models. They're fantastic, hands down the best for recoil reduction I've ever felt.
There's only one down side that I can think of. That is after a number of rounds fired it will wear and need some tightening up. For me this was about 5,000 firings.
Very Brown is a first class gentleman of the highest integrity. Buy one, you'll like it. cls