Just following up. Finally bought a new Samsung heat-pump dryer, and so far, I am pretty impressed. My primary concern from the reading I did was that it would be much slower than the old, vented unit, but is does not seem significantly slower and with the additional capacity is arguably faster.
Have not piped in the drain yet, so the water collects in a tank, and it is pretty interesting how much water is extracted from a load of laundry.
Underwear, towels and bedding all seem noticeably softer and less wrinkled than with the old unit as well.
Only bummer was that the Samsung "installation" team was largely useless.