They're dope as hell. I got one on my dryer. Shit works fine and uses so much less energy.

Chest freezers

For good reason. I don't live in the family home anymore, but last winter when I did move back in for a while, I had approximately half as much work to do keeping the damn place warm, thanks to the heat pump. But I mean sure, I could also just buy one of those fancy newer automatic furnaces to replace the old furnace, and there'd be no work at all! Except that costs at least 5x as much as I paid for a single air to air heat pump that also makes summers bearable.

All this for a relatively modest cost in terms of electricity because yo what the hell, heat pumps are more than 100% efficient when heating. It seems like we hacked physics, honestly.