Looking for feedback on "On the Wall" or "Ductless" Air Conditioners

Coincidentally, I’m having someone come Monday to give me an estimate on an install. I have a 170-yr old farm house, so no ductwork and limited crawlspace. I’ve been thinking about mini splits for years (see my thread from 2012) but needed to upgrade my electrical first.

I’m thinking of a 18K BTU dual head unit to heat/cool the part of the house I mainly live in. Down the road I can add a 2nd unit if I want to expand.

StG