The loss of mobility is acceptable to me. My loss of mobility will not be as much as others. The gun only weighs about 14 pounds, which I am told is no where near the real saw. As I am a large guy (6'5" & 330) it will not slow me down much.
My only concern is that with so long a barrel, CQB is not where this gun will shine. Anywhere else, its kinda scary/exciting. I can hardly wait to use it on other targets than empty cans and boxes.