I just have recently got the Gerbing heated gloves ( the older ones) right after I got them did I start hearing about the G3 to come out, Figures.. But I've found that the older ones work great as far as warmth, they do feel bulky, and tends to make control of the bike a little odd for several miles until you get the feel. (everytime).
I haven't had them long enough to give much more info on them but the wiring through the jacket (I don't have the Gerbing jacket liner yet) can be a real pain in the ass. Almost need to sew in securing points.
I did get the HD dual controller knowing that the liner would be forthcoming, but found that the Gerbing on/off switch was easier, without all the extra wires to deal with. The temps out were to cold (20) to not have them on at max anyways.
My brother Scott has ordered the G3 gloves and I'll compare his then. If much better I'll donate mine to my wife, she's on the back so no control issues there.

Mark