I also have a Moultrie I-40. Its a great camera except sometimes it cannot tell when to get out of IR mode and back to regular mode, so many of my pics are in black and white. So make sure its in a nice bright spot. I used to have it 8ft up in a tree angling down, but that position did not let enough light into the light sensor and gave me tons of B+W pics. So I have now put it lower on the tree.
Battery life is Excellent.
Check this site out. They do real good reviews on many different models of camera.
http://www.chasingame.com/