I've never done a heat pump so I've no idea, because
Homeowners who live in extreme climates have been traditionally left out in the cold when it comes to the ductless cooling and heating revolution.
Assuming the new (meaning expensive?) technology works, that means you can now use a heat pump in climates where you couldn't before... I guess.
Their selling points (none of which can't be achieved by a well balanced normal split system) : "Consistent Room Temperature - No Ups and Downs, Ons and Offs" - "Consume Only The Energy You Need" - "Heats Up Quickly" ... all of those are intrinsic to a well-installed system of any kind.
"Energy Use is Even and Steady" - that's the only difference. How 'real' it is, idk.
From what I understand, if you can get away with a heat pump that's awesome. You living in NY and me in Chicago, can't. But even if it works, is it a $20k dollar unit? You get one of three things: comfort, efficiency, or environmentalism. Tweaking it to add more than one just costs extra money. Bottom line IMO is ROI levied against comfort.