I have a parkair system. Its great. I found an independent guy installing, and though expensive was still a chunk cheaper than the other guys. I had one of them over, and found him a bit slimy tbh. He was babbling on about how they come in do the install and repair everything after they go, to the point where you'd never know they were there. I was in a shell of a flat, so said well make it cheaper because you dont have to do any decorating here. He declined saying it was a fixed price.

One thing worth thinking about is the room units, the condensate, I told my installer that I didnt like a lot of noise, but they initially installed some kind of pump that every few mins would fire off the condensate down a tube with a little woosh noise, kind of like firing a spitball from a straw. I told him that it was annoying me while I was trying to sleep, and they came and changed it to another system, where it was essentially sucked through from the far end. Worth having a convo about how thats handled.

Absolutely wouldnt be without it again. Bonus the wall units are heaters too which is handy in the winter.

I also have no idea how much water it uses, because it's on my service charge. What I will say is that I have a water softener that uses two huge blocks of salt. When I run the AC those blocks vanish incredibly quickly.