I'd say it was more of an impulse buy than an actual researched decision. When I was finally delivered, I had no idea how heavy it actually was. Do any of you have a problem with the weight\camera shake when not on a tripod? Any suggestions on how to avoid it besides the regular stabling methods? Settings?
I don't know about the sigma, but I have the canon version for my 7D. The weight is actually not a big problem, I support the lens with my left left hand and have my right hand on the regular spot. In low light I use the left hand as tripod by holding it firm agains my body.