I had one briefly and got rid of it quickly because it does not work well with bottle guns like the Impact.
The pros were that the big carbon fiber legs were nice and beefy and BOG's customer service is top-notch - very pleasant and responsive.
The cons were that there's no good way to clamp a bottle gun . . . but more importantly, the head is not strong enough to hold the gun indefinitely in any position at all. No matter how hard it tried to cinch down the head, the butt heavy gun would always cause the head to tilt backwards pointing the barrel up into the sky. The longest I could ever have the BOG hold an Impact in position was a couple of minutes.
You'd be better off spending a little more and getting an actual tripod with good ball-head combo. That's the route I took after the BOG and am a lot happier; any rifle I put on the tripod stays at any angle indefinitely until I decide to move it. There are several threads in the Other Parts, Accessories, & Equipment subforum that give a lot of great info on which tripod and ball-head to get. Save yourself the time and headache and just skip the BOG.