Are these units actually worth the extra cost and installation headache?

YES THEY ARE!! We recently moved to a new home. Although our new home is
superior to the old one in every aspect, we do miss one thing. Our old home
had a heater just like that in the bathroom, and our new home does not. We
sure miss the 'ol hot air blower on cold mornings! It was really nice. We
are considering installing one at the new house.