I have a friend that bought the Caldwell with the windage top, and he is disappointed. The main shaft with the mariner wheel, the threads are too coarse, so small changes are difficult. The bottom T if you tighten it slightly too much, it locks the main shaft as well, so your caught between guessing, too tight or having it fall. There's a lot of slop in the whole thing. For someone that only shoots a few times a year it will work, but a cast iron RW Hart, Sinclair or a Bald Eagle would be much better. Weight is your friend, so skip the aluminum. I have a hard time with the guys that suggest a bi-pod for group testing, and feel sorry for those that don't shoot off a GOOD rest, with the right rear bag.