Summary: Use this grip on my Nikon D60 and works rather well. Fills my hands just right for comfort and stability and increased life expectancy during shoots in addition the 6 extra batts come in handy but haven't had to go that route yet.
Summary: This little add-on is great for what I do. I love having the extra power, as I shoot a lot of images at a time. It holds two of the D40 batteries. Not sure how many images this will provide. Guess it depends on the images and the power drain on the camera, but for me without using the flash, I am guessing 600-700 images on two batteries. It also comes with a holder so that AA batteries can be used.
Summary: I use my d40 as one of my backup cameras and as an extra when working with students. Although I have only seldom needed to replace batteries while working with it (as it is only a backup), I bought this product just in case. Finally, I feel like I can get a solid grip on the d40 in the horizontal position and an excellent one in the vertical without fear of it slipping from my fingers. It also adds some nice heft that helps to balance heavier lenses.
Summary: This product is a great value for the money. I adds very useful size to the smallish D40/D40x cameras (although it is heavy). I have large fingers, meaning that my small right finger won't fit on the existing camera grip. This battery grip allows me to hold the camera normally. The grip comes with two battery holders, one for the EN-EL9 battery (will hold one or two), plus one for 6-AA batteries, to get you by in case the Nikon batteries die.
Pros: Allows 2 EN-EL9 batteries, Can use AA's in a pinch, Good Value, Increases grip size, Portrait shutter button, Versatile
Summary: I have big hands and this grip does the trick. Out of the 3 grips I found for the D40 this has the best options. For one you can use 2 of the Nikon batteries or 6 AA batteries. The other 2 grips have built in batteries and take 4-6 hours to charge. The vertical shutter is really just a built in ML-L3 remote shutter, so it does not act like a real shutter release like on the camera. But it does an OK job.
Summary: "A" For overall product quality/sturdiness. "A+" For allowing the use of one or two EN-EL9 batteries simultaneously thus reducing the need to replace the battery during lengthy project assignments. "A+" For accepting AA batteries - An invaluable way to have backup power resources. "A+" For easy access to a conveniently located additional shutter release button in the vertical position.