This was my 2nd ff-light after the disappointing p01. I was really surprised with the e07x canon. The only con I had with this light is that it's a little bulky for my daily use.
However, I was truly impressed with the rest of the light. It has a very good driver. The moonlight is super low and the turbo is really bright. It can hold a high output without getting hot. The button is really nice to press as compared to the stiff p01.
I am also very happy with the firefly leds. They have very good tint and power output.