I used to use a Hilti recipro' on a 63 year old who could not get enough of having something pumping inside her. I still have the saw and it brings back fond memories. It weighs a ton though and was tiring to hold, i see that small single handed saws are now available. I tried one belonging to a friend and it is absolutely crap at what it's intended for but I think I know of a field of work it would excel at.