I have a Gottos tripod and MH1300-657 ball head. I've never had a problem until I got the Sigma 150-500mm lens. My ballhead can't handle that lens at all. I called B&H and asked the salesman what he recommended I get and I was shocked at what he said! He recommended an Oben OBBA2 ballhead. He said that Oben is comparable in quality to the big names, but a lot less money. That's an $89.00 ballhead - do you really think that would work? Any suggestions would be greatly appreciated. Thanks!