I'd love to get a vertical grip, but like dr4agon its hard to justify the price. I have seen the 3rd party ones on ebay, but I wondered if there were any issues with ruining batteries (or worse the camera's battery slot) or with reliability. Are they made out of cheaper materials and prone to stripping out of the tripod mount, and dropping the camera? Has anybody had one of those?

I have certainly wished I had one on the camera when I have done longer shoots.