Although I've been a shooter since the age of 10, I'm only recently a handgun shooter [last 2 years] for purposes of concealed carry and personal defense. I have two pistols - the M&P full size in 9mm and just recently the M&P Shield [also 9mm]. At an informal shoot, one of the instructors who also was a part of the meet up group watched me shoot and said I'd shoot better using the "thumbs forward" two-handed grip rather than the "thumb-on-thumb" grip that I've been using [she called it the "revolver grip"]. That's the second time a professional has volunteered that info [first one was a very helpful member of these forums - thanks, Ian!].
I'm not at all comfortable with thumbs forward, which I've tried before, and it's a slower way for me to get a two-handed grip from holster to presentation. Is the thumbs forward grip really all that much better?