Heatpumps really have only one downside: The condensing unit. With it not being removable, if it gets clogged up, you have to disasamble the whole dryer, take out the whole compressor system, and build it back up. A long and complicated process.
Which dyer do you have now, Mac?
I recognized that there are even big differences within heatpump dryers. With the "old" Miele and the AEG system being the most gentle, the fastest are BSH and Miele. Efficency goes to AEG and BSH, while I'm still most impressed with the variable compressors used in some models across the bord.
The 10/16A setting is a really funny thing. Haveing owned one of those (in my opinion not even that good) dryers, I played around with this setting, and in the end, it simply sets the dryer to low heat if you limit it to 10A.