More or less ... 6

Construction side, I have mixed feelings.
The rubber is of good quality, although not identical to that of the case itself.
The finishes are generally reassuring (tightenings of good quality, transitions rubber / plastic carefree). However, the battery drawer latch release do not really inspires confidence and makes noise (like a moving piece rattling) when the camera is tilted.

More embarrassing, sometimes the grip block certain functions of the box when it is not the encoder which is on the loose and has no effect.
In addition, the grip does not appear as recognized by the 6D in the menu, the battery is associated with an exclamation point

It is not a perfect product, considering the price, it is not aberrant but it is difficult to trust him completely, in any situation.