My wife and I had one installed Fall 2019. Was a bit of a nightmare, as our outdoor unit had a bad valve in it. The installers had a tough time diagnosing it (took seven months of near weekly visits), then COVID prevented us from getting the proper parts. Now everything is working properly and we're really reaping the rewards this week.
We have a 1500(ish) sq. ft. rancher, was all baseboards. Open crawlspace. We spray foamed our crawlspace, installed ducting and went with a big-boy unit from Daiken, which I think cost around $18k (*revised, checked the invoice). Decided not to go the mini-split route because our layout meant we would need two outdoor units and three indoor heads, cost delta was about $5k, but we figured that it was a better long term solution.
We were supplementing our baseboards with our woodstove, after the upgrade we slashed our hydro bill by 60%, saving roughly $120/month on hydro. Didn't burn a stick of wood this winter and we're toasty and warm all year. Ours worked fine below it's stated rating of -1 C, but part of the cost of the Daiken system is that it has a supplemental electric furnace that kicks in if the heatpump is having issues generating enough heat to keep the house warm. I think ours kicked in once or twice this winter. We control when it kicks in as well, currently set to kick in if house drops more than 2 degrees below desired temp, or if the unit labours for more than 90 minutes without hitting desired temp.