Heat pump dryers have a huge drawback though: the heat exchanger is woven through the condenser. So you cannot remove the condenser from the system. The lint which is not in the trap thus builds up in the condenser over time. Bad enough, but that's also where the moisture goes. So after several years it will start to reek, and your laundry will start to reek, as the reheated air goes through there.

So, long story short, cleaning that mess: you're going to have a bad time, as you can't just remove the unit and cleanse it under running water. I would rather buy just a condenser dryer (or check up whether heat pump dryers became better, our model is 7 years old now, maybe they're better nowadays).