Thanks, most of what I do Alarms and CCTV rarely need anything bigger than 10mm as the cables are not that thick. The only issue I found when I had my Milwaukee 18v SDS none Fuel was that it was really heavy and too big for general day to day work. It only helped when doing Fire Alarms which we don’t do much of. Plus the odd occasion you need to do 20mm holes.
An idea I have thought of is go with the 18v kit, I’m not sure if that one I have posted is the latest or the best model etc. Then buy a 12v SDS for the smaller jobs.