I bought my first Windmill AC for my bedroom, purchased from a retail outlet. I purchased a second for my living room after installing the first.
Installation was pretty straightforward, especially if you've installed other window ACs. The process is pretty much the same, but Windmill instructions are super clear, and they provide scissors for trimming the side trim. Delivery was fast and smooth. And they look fantastic, inside and out. My bedroom one isn't one of the whisper quiet ones, but I'm OK with that. I like the hum, helps me sleep. I did get the quiet one for use in my livingroom, and it doesn't really interfere with my TV watching. Very quiet, much more quiet than the one it replaced. The app works great! Though you do need to find the right app, there are a few Windmill apps. It also works with Google Home, to turn on and off the unit only. Other controls require the app. Very happy with my 2 purchases!