Negative Positive
Title: Not a must, good to have, for balance, convenience, power
Review: If you just the Digital Rebel kit and don't want to spend too much money on accessories, this is not for you. A single battery has enough power for a trip or even a few days vacation.But if you are a powerful user, will buy more lens, especiall the heavy L lens, a 550EX flash which is also bulky, I would say this is must for you.With 10oz grip and 2 extra batteries (seach on e-b-a-y for cheap generic ones), the camera feels more comfortable and stable. Even with 550ex attached to it and a 70-200 4L lens on, I still feel it is well balanced. And 2nd group of button is really convenient for portrait. Of course, 2 batteries always have more power.If I remove it, with 550ex flash on it, I really feel awkard to hold it.So if you just have the kit, forget about it. If you have external flashes (550ex or 420ex at least), L series lens, don't hesitate, buy it.
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