I used to have one like this and it was the best. Unstoppable, even with a 6" hole saw, but balanced, leveraged and clutched so I never got hurt. My first one was stolen a while ago and they're pretty expensive so I got along with the monster for a while. I already had a porter triple gear cord drill (looks like they are no longer made maybe because they last forever so people only buy one for life - it looks like this: Makita 6013BR 6.3-amp 1/ 2) - inch overhand grip drill) is also unstoppable, but not the right tool for the job - not designed for jet drilling, not for working in tight spaces and without a clutch. After spraining my wrist and injuring my hand (at the same time!), I decided that investing in the right tool again would be cheaper and less painful than going to the doctor. I've used Timberwolves, Hole Hawgs etc but this one does the best job and hurts you the least. Did I mention it can't be stopped? Did I mention the big plastic case that comes with it so you can carry that and some stuff? Did I mention that the handle end of the body rotates (and locks in place) and the D-handle rotates (and locks in place) or can be removed?