Well, first things first, you're like me looking for a Grip for Canon 70D your wonderful. Because one already you can put a battery in it more (let's be realistic battery you can put in your pocket and change it when it is empty!). 2, because it is much more comfortable for portrait! But the real reason between us is that you will appear more pro. And this is true because this grip is comparable to the original and above all the money! The possibility of the batteries, the possibility of using the infrared remote control as well as having the trigger buttons directly on the finger when you take your photo.
Now about things that fa (u) Chent! The batteries, so these two little things that come with that hold moderately well, it is very very very, but then very very very far from a Canon official battery. But hey it's always fun has been the basis you were gone to buy a Grip!
So do the math together two batteries + grip + remote control: 70.99 euros. The Grip Canon?