I Agree here, got mine working to a decent standard with all my kit now, and the Harmony is having a well earned rest! The app and setup definitely need some streamlining and polishing, and the database for basic things needs some work, but the potential is definitely there.
Also got mine working pretty well now, it just takes a bit of time to get your head around the app. Got activities working with my TV, Av Amp, Chromecast, DVR and a Windows 11 PC.
Yes works with mine no problems, over Bluetooth. Just add it as a Bluetooth device on the X1 app, follow instructions given by the app and pair it with the Chromecast from the Chromecast setting menu.