We use hundreds of Atlas-Copco assembly tools at work (assembly plant)...handheld straight and right angle, large fixed nutrunners, torque-controlled pneumatic impacts, basic impacts, etc. They're proud of them but they work well and are pretty cool.
My favorite application is our valve lash setting machine. It has two dual-concentric-spindle nutrunners to loosen the locknut, run down the lash, and tighten the locknut, all within seconds. It's amazingly accurate and the algorithms it uses are bonkers and make my brain hurt.
The newest electric ones they just came out with are awesome....they have accelerometers and gyros to measure relative location and are much easier to program.