I have not heard much about Bec Pros on AVF. I have had mine a couple of months now (I think) and bloody love it. The ability to manipulate the power used at different times on the same fire is fun to play with. I find I taper off the power over a single fire.
I have a provari 2.5 and a provari mini as well as an eleaf Istick and find that I use my istick when out and about and my Bec Pro when at home. The provaris just sit in a drawer. Anyone else got a Bec Pro?? Really looking forward to chucking an atlantis on it next week when they arrive.