Instruct: Classify Amazon reviews into positive or negative sentiment
Query: All things considered, a good deal

The Opteka battery grip looks and works exactly like the Hoodman, which sells for $100 more. The only advantage is that Hoodman offers a pricey modification allowing use of the vertical shutter release without the cumbersome infrared cable (which is pretty much useless). The grip serves two useful purposes: it doubles battery capacity, which means that you can shoot heavily all day without recharging, and - most importantly to me - it offers a larger grip space and balances the camera when used with longish lenses like the 80-200 or 70-200 zooms, or the 300 f4. Also, it's lightweight. The lack of a vertical shutter release is a drawback, but as another reviewer wrote, that's really Nikon's fault. All in all, the Opteka grip does what it's supposed to do at a good price.