nyne wrote in post #7633112
btw...what camera do you have? I find that the issue of balance definitely comes into play with the rebel line...even with my 17-50 2.8 Tam I find that I need a grip on an XTi otherwise I feel too much pressure on my index fingers.
That suggests to me that you're holding the camera awkwardly - maybe holding it by the sides of the body, like a point and shoot? I've used my 400D (XTi) with some quite large and heavy lenses (Sigma 100-300 f/4, for example) and there is no pressure on my index fingers at all. Basically, the left hand is supporting most of the weight, under the camera + lens at the balance point (which often means it's holding the lens, not the camera), and the right hand is used the operate the controls and provide added stability. The right hand should be quite relaxed. Take a look at this page for some ideas:
http://knol.google.com …our-hands/3k0expg5xjecw/2
As to the OP's question...
Grip vs no grip is a very personal question. Be wary - these threads quickly fill up with 'grip evangelists', who assume that everyone likes them
It's certainly not true that everyone who tries a grip sticks with them. There are plenty of people who have tried grips and don't see much point, so you have to try one for yourself. I'd also suggest that you are sure your hand-holding technique is sound first, before spending money on a grip.
Personally, I think the extra battery life is a red herring - it's easy enough to put another battery in a pocket, and it takes seconds to change. The 'improved balance with heavier lenses' is something I've never really understood, as you're holding the camera + lens at the balance point anyway. For me, adding a grip just makes the rig heavier and therefore harder to hand hold. The extra shutter button in portait orientation is a real advantage, so it may depend on how much shooting you do in this orientation.