Camera Cube to level while shoot

Measuring 1 inch all around, this leveler attaches to any camera with a hotshoe. The three-way axis lets shutterbugs take straight snaps whether the camera is mounted vertically or horizontally on the tripod.
Some dSLRs such as the Nikon D700 have an onboard electronic leveler, too, though critics may say it won't be as accurate as a bubble-based one. For me, I'm not sure if the Camera Cube is worth the $15 indicated on Photojojo's Web site,