So far so good. They do seem to be regulating very well. Very little drop off I have been using a boge 3.0 and at 4.2 volts with a test box and multimeter showing 4.06 - 4.1 so that is not to bad with a china mod. I'm still using the original batts, I am going to order a set of the efest 18500 to see if there is any difference.
I have been wanting to try the resurrectors for a while, but the boges have been ok for now. A few dead ones now and then but if they don't get any better i'm gonna have to go to something else.