Sure, but should the pick gun fail, your locksmith (hopefully!) can do it the old-fashioned way, too. And pick guns take a lot more skill than people think, they still require a skilled operator to be effective.
I agree with the former, but for the latter, scrubbing a lock isn't all that hard (it takes two or three tries with the pick and it's open), and I can't imagine the gun being harder than that. In fact, it's marketed as the easier way to scrub locks.