FWIW I've bought several of these (my 7D and 5D2 are rocking them at the moment) from Amazon, under brand names such as "Neewer" and others... they've always been delivered as the Meike grips.
The Grips are not quite as solid feeling (the doors feel a bit flimsy), but they have always been 100% functionally for me, at only 15-20% of the price.
I have never been an early adopter, I wait until places like Amazon's fullfilment stock them for easy returns "just in case", however I've had a great track record so far.