I wish some company would make more aesthetically pleasing ceiling cassette units suitable for residential use instead of the wall mounted mini-splits. Most cassettes are 24x24 which is great for commercial applications but a nonstarter for residential ceiling joist widths.
Its an interesting idea. Install would be more expensive because you have to fit it nicely into the ceiling drywall and also snake refrigerant lines through the ceiling. Wall units typically have a hole drilled straight through the wall for condensate tubing and refrigerant line access. There's a wall unit on the Electric Air preorder site, thoughts on the aesthetics of that?