It's a bit hazardous trying to wipe the passengers mirror on the go though.
I didn't realise how good heated mirrors were until I bought a car that didn't have them. The owner of this 100 has found the same thing.
Scraaping* the ice off frozen mirrors in the morning isn't that bad (and it cleans them really well), it's not that often and I'm usually scraaping* the windscreen at the same time anyway. It's having them fog up when driving through a damp patch that's the annoying part.
*I've put two "a"s in scraap so the swear filter doesn't wrangle it to scraping.
My 4R doesn't have heated mirrors, it does suck in the winter. I carry a spray can of windshield de-ice, those mirrors break easily when you try to break ice off them. They supposedly have a hydrophyllic coating to repel water, not sure if mine do.