OP
Nice to have someone here as experienced as you. yes, hilti is expensive but the cost is not a big factor to me but as you have already told cheaper options do their job pretty well, i will have one of them for sure.I have bought used and dispensed with most major brands. A friend of mine bought the hilti option, within weeks found that they were not up to the job. A cost ananlysis of hilti and other less expensive drills leads me to incline toward less expensive as in the long run it is cheaper to replace cheaper drills that last as long as pretty well any drill. Brushless and 5 AH are the way to go. What do you want in a drill. So in my view a drill that can last all day battery wise and not burn out. My best drill so far is the milwaukee set. I think most drill makers now do interchangeable bodies/batteries so that you can get 3/4 batteries to use on all your tools. i.e. circular saw, angle grinder, jig saw and drill hammer and impact. Impact is a must although noisy in offices and tends to annoy the tenants. Hikoki drills seemed to always fail on the chuck for some reason I replace the chuck 3 times and stopped with that drill. De Walt seemed to not like my work routine which consisted of maybe 200 plug and screw operations on long runs of conduit in offices. Some do smaller drills. They have cut the body weight down which is also good if you are doing lots of drilling as we do. I normally have at least four drills on site hammer/impact. Of course there is always a battery on charge ready to continue the good work. So decent AH batteries is required for hard work. As I say so far the milwaukee have shown they are good drills for hard work and show no signs of packing up yet.
Thinking about buying batteries with fuel gauges or smart chargers to extend battery life