A question for roofing installers?

ok i am going to try this again ,If there was a composition roofing shingle cutter the same size as an 8 or 10 foot magnetic level with a built in cutter & it attaches as easy as a magnetic level ,would you use it ,its light weight ,all aluminum ,and cuts through the shingles like er.it is all automatic via a hand held switch.that is the question.a new tool introduced on the market.yes or no do you think it is a good idea or bad,you the laborers.and your the ones i am asking.