I have a genuine Canon BG-E9 grip on my 60D and had two spares since I received three as gifts last year. I sold my two spares since I knew I would never need them, but as it turns out I now need two more for two of my three sons who now own 60D cameras. I've been looking at the various knock off brand BG-E9 grips and just want to make sure I avoid the brands that other have had issues with.
Brands I've looked at include Zeikos, Neewer, Opteka, and Meike. By looking at them online I can't tell a thing about how they'll compare to my Canon grip.
Please share your experiences both positive and negative with any of these or other off brand grips.