I am with the quality very excited. I especially like the pronounced thumb rest, this was among other things, a reason for buying. Previously had a Canon 600D with a Meike Battery grip, he had this thumb rest not and I find the handle of pixels is thus much better in the hand. Thus I want to talk to Meike Battery Grip not bad. The quality and functionality was also very good.
So back to the Pixel / Vertrax battery grip. All buttons and scroll wheel work very well, even if the haptic is slightly different than that of Canon. The trigger like it even a little better than that on the Canon 70D.
The plastic and rubber are identical to the Canon body and if you do not know, you might think you have the originals on it. The Pixel battery grip is even made from the inside of metal, so that it could survive a fall without prejudice.
All in all, highly recommended this Pixel battery grip. Have been buying definitely not regret it! Full 5 stars, unfortunately there is no 6 star :-)