Last year I splurged and treated myself to a battery-powered SDS-Max roto-hammer. It was so expensive I had to hold my breath and cross my fingers as I signed the check
The tool was quite the aide in driving in a pair of ground rods. What about other uses?
Yesterday I had to drill multiple 7/8" holes through 8" of concrete. Compared to using my smaller SDS+ driver . . . well, there is little to compare. Holes were drilled with almost casual ease. It was much easier to keep the holes straight and in the proper positions.
The only downside / caution is to note that even Li-Ion batteries have a limited shelf life -- and this tool gobbles batteries. Make sure to top off charges in advance and have spares on hand.
Horizontal drilling? There's enough weight to the tool that it's worth rigging some manner of support.