I'm not yet at the point of buying a heat pump dryer. Mostly because we're a family of 4 and I don't want to run 20 tiny loads a week.
But I will share my recent appliance purchasing experiences.
7 years ago we purchased our first house and didn't have time to shop for used appliances so we purchased new with the extended warranties. Seems like a dumb decision, right?
Well, the fridge compressor failed. Warranty company couldn't get anyone out here within a reasonable time. So they gave up and refunded us the full purchase price + tax + cost of the extended warranty. One call and I had a new compressor installed the next morning.
The washing machine failed. This one was slightly more frustrating. It took about a month for the repair tech to basically give up and say it needed a new harness. This totaled out the washer as far as the warranty company was concerned. They refunded the full purchase price + tax + cost of the warranty. I had already looked at it and suspected the motor controller has failed. 2 days and a $150 part later the washer was fixed.
The dried had a failed bearing that I should have called in, but it happened right after the washer fiasco, so I didn't want to go through that again and just fixed it.
In the end, I paid for a clothes drier and got a fridge, washer, and drier. All are still going, it's only been 8 years, but they're doing alright.
So, when I do buy a heat pump dryer, I'm not too concerned about parts availability.
I'll be saying thank you very much, yes I'll take the longest warranty you'll sell me. $100 well spent. Just don't loose the paperwork!