I'm thinking of buying the 5Diii, and getting the vertical grip. Does anybody have experience with 3rd party vertical grips for the 5D, 5Dii or 5Diii? There is a large difference in price, and while it shouldn't be rocket science to make a 3rd party version, how well do they work? And would the usual L-Brackets (Kirk, Wimberley, RRS, etc.) work with them?
The Canon version for the 5Diii is about $350 at several sources, and if history predicts the future, there will be 3rd party versions at $100 or less.
Bring in China there are lots of choice, include the Canon ones. It is hard to justify, usually it is that if you don't consider budget then buy the Canon, if you have concern about budget, plenty of choices. I don't see significant difference between the Canon and after-market ones, and often the after-market ones offer some extra functions - to be competitive. I don't use one because I like the compactness of 5DII/5DIII, but I have lots freinds use after-market V-grip and they all work well.