Mo- I own the BR1000..I have shot off this thing for 3-4 years at least. It certainly has alot of upward adjustment, which is great for the areas that I practice longrange shooting, usually uphill.
I have ran into problems with this setup though. If you want to shoot downhill, or even at a target slightly lower off a bench. You will need a taller rear bag than a standard bunny ear bag, I have one of those huge Protektor 25lb hump bags just for this.
This rest dosn't have a true side to side windage top, if that bugs you. You can always upgrade to a hoen or a shade tree aftermarket rest top. Or steer the gun with the rear bag.
The real benifit of this rest, is the upward adjustment, If your shooting up mountain sides.
I am getting into some F-class shooting, I will shoot this rest to begin with. But its really so heavy, I practially wore myself packing that and all my equimptment to the fireing line last year in 100+ degree temps. I just might get a lighter one, then again I could use some exercise.