I can attest to everything you mentioned. It's flat out the best self-leveler made. Job after job you get consistent results and performance. For jobs you might normally skim with Ardex Feather Finish, try Ardex K-55 @ 1/8" thick. That's what's is made to do. Saves tons on labor and the substrate will be everything the flooring installer wants - flat and incredibly smooth. As a former Ardex employee, I can't tell you the number of times installers challenged me with claims of a product "just as good as Ardex, but cheaper." Ya get what ya pay for.
Concrete Restoration Services, LLC