I wouldn't worry too much - I think the people saying it'll die and you can't get parts are the outliers. I've got one in my house going on year 4 with zero issues beyond a loose nut that was making noise. it'll make heat without issue Friday night when it's crazy cold.

I used to be in commercial HVAC and oversaw installation of literally thousands of heat pump systems in VT. we serviced thousands more and maybe had a dozen lemons. that's a pretty good ratio. parts availability since 2020 has been problematic, but that's across the board from cars to refrigerators. it's getting better. overall, heat pumps are pretty reliable if you take care of them.