I got to play with one at work, and I'm a huge fan. If I were building a relatively heavy gun, that's the direction I would go.
It definitely excels at some of the little things. I have long fingers, so the adjustable grip length is really nice. Also, on-the-fly length of pull adjustments are nice. Overall, it does some cool things, and the price is mostly in line with chassis of similar quality.
Last thing is that the squeeze adjustable bipod slide is really cool, but only functional with the detents on the chassis.
I'm far from an expert, but I really dig it.