I've got the BR, the 6-9, and 9-13.
I feel each has their uses. But 6-9 is the most versitile for what and where I hunt mostly targets and vermin, in prone shooting.
For hilly terrain particularly, if I know I'm starting at the bottom of the hill and working the bottoms of the draw or climbing up. I like the Tallest of Tallest of bi-pods. So I can aim up-hill easily.
If I know I'm calling a critter in to a call. I like the sitting bi-pod or stick.
If I'm hiking downhill on a hunt, I go with the shortest of my bi-pods. The BR-swiveling. Downhill aiming is easier with a short bi-pod, as long as vegitation is co-operative.
I really prefer the swiveling model, I have non-swiveling they are just a pain. I don't own a notched leg model, but would like to try them. Simply because they are quicker (they pop out with a push) the opposite of the friction where you have to push the button to collapse the leg.
