I use a 2 handed BH volley, and most would consider volleys the best part of my game. I actually use my left hand/arm quite a bit in my 2 handed BH volley. It's almost become a left handed FH volley. I can use one hand when I really have to stretch for a volley. I'm basically a self-taught player. I do clinics, but not many private lessons. The pros who do my clinics have advised that my 2 handed BH volley is fine and there is no need to change it. I'm a female 4.5 player. My wrists, shoulders and arms are pretty strong as well. Personally, I think players should use what works for them. I know quite a few players with 2 handed BH volleys.