So far (about 2 weeks) I'm quite happy. At first I had a little concern, since I (unfortunately only after I had ordered) had read the various reviews on Battery handles this manufacturer for other DSLRs. As reported by some massive problems with the electronics in my product I can do this, however (so far) not confirmed. The quality is in my opinion quite appealing, the controls work properly. If I however the shutter button or the mode dial with genuine Canon quality comparisons (I have on my EOS 40D a Canon original handle), this handle cuts something worse, which is why only 4 stars. Unnoticed battery discharge or other electronic problems I can not confirm. The two supplied batteries behave after 2 charge-discharge cycles, as they should, a final judgment here I can not give, of course. Other batteries from the same manufacturer, however, run with me for about 9 months without any problems, a perceived difference compared to the Canon-original batteries, there is not. All in all I can recommend this battery grip.
