For some reason, I am dying to have a battery grip. Maybe because I am the typical american who thinks bigger is better. (it is) but also everyone I know who has one, just LOVES theirs. I can think of ONE practical use for it... so you don't have to switch out batteries as much... which seems silly, because changing batteries takes a whoppin 30 seconds. There must be more to it than this, because so many people buy these grips and so many people just "wont do without one". With my 40D, I like that it is heavier, and fits my hands better... it really balances out my 70-200 a lot better than my XT. So, I would assume that a battery grip would help even more. Is this true? Would a grip help with stability in general? What do you guys think? It'll be for my 40D. Why do people buy these?