This is a great drill for making holes in tight spaces.  I have gotton by over the years with a 3/8 inch electric drill and spade bits/hole saws to make all of my holes, but I dislike the spade bits because they take forever and quickly wear out, while hole saws often bottom out when cutting anything thicker than 2 by lumber.  But this drill, combined with Milwaukee's and Dewalt's resharpenable self-feed bits, makes drilling holes almost effortless and I can now reach spots that I could not have before.  The lower RPMs combined with the extra long side handle keep this high torque drill under control when drilling large diameter holes.  I purchased a reconditioned unit for the equivalent of about 3 weeks of fees at the local rental center and it looked brand new.  I have had good luck buying reconditioned gear and I tend to trust this stuff because I believe that they have been carefully examined and all the defects removed.  There's no doubt that this is a specialized tool, but if you have a lot of plumbing and/or electrical work to do than it may be worth getting.  It will save you a lot of time, grief, and sweat in the long run.