I've retired a 5" Porter Cable, 5" Dewalt and 6" Bosch. I now have the Festool ETS EC 150/5 and am super happy with it. You indicated weight of a 6" sander but the Festool is significantly lighter than the Bosch 6". It's been a while since I had the 5" sanders and haven't compared specs but I suspect it is comparable in weight if not lighter than the 5" sanders I've owned. Festool does a great job of reducing weight of the tool while optimizing function (including dust extraction).

I also have the cordless 5" Festool with edge attachment. I'm very happy with it but it isn't my go to sander. The Festool 150 is a terrific sander and an improvement over all the others I have experience with.