oldermodelguy
I'll stick with my Badger power mixer since I already have it.
I'm mostly using MRP lacquers, which are really thin, so nearly all of the paint slides right off the end of the mixer, back into the bottle, before I even fully get it out of the bottle's neck.
It works perfectly for Testors enamels too without much waste, because I mostly use those to brush paint, so what's left on the mixer goes right into the palette to be used.
Might try one of those lab mixers some day though because of the ever-present possibility of knocking the bottle over while mixing. Hasn't happened yet, but that MRP paint is expensive stuff, so it always makes me a little nervous. Just not sure something like that would work as well on paint that has been sitting a long time and has partially congealed. The Badger always does the trick in that situation.