I had a 3rd party grip on my rebel and I was quite happy with it, although I could tell the quality was not *quite* the same as the overall quality of my T2i/550D.
I now have a 5D mk III and am REALLY impressed at the quality difference of this body. I'm not excited about having the build quality of my previous grip on this new body for two reasons:
- While the quality difference between Canon Rebel body and 3rd party grip was not great, I'm afraid it would be REALLY obvious on a higher end body
- The weight difference between my Rebel body and EF-S lenses and my 5D body and EF lenses is quite marked, I'm concerned about how a 3rd party grip will hold up
Any thoughts from people that have used 3rd party grips with better built bodies and heavier kits than I have?