Interesting how the Canon logo or the BG-E11 model # are not stamped on the front of the grip.
It's a genuine grip...I got mine yesterday and it's logo free.
But wow, this thing is BIG! Back to back with my 1D Mk4 the 5D3 with BG-E11 is taller, thicker and feels bigger in the hand. I'll put them both on the scales later but the weight difference isn't that much.
Mostly I use 1-Series bodies, my last 5D was the Classic. The 5D3 with BG-E11 is way bigger. The 5D series has grown!
Later: OK here are the weights. Are you ready for this? The 1D Mk4 with battery is 1375 grams and the 5D Mk3 with BG-E11 & two batteries is a beefy 1406 grams. Wow! I used to pack the old 5D as a lighter weight option.