The Windows client is much better after the last major release, but it's never been as slick as the Mac version (the biggest wart now is the system tray/browser extension popup).
1Password X looks nice until you try and use it, and all the company reps on the forums are very argumentative about any feature request (look for the pushback they give about resizing their super-cramped browser extension popup—and the issues with hires screens stemming from how they built it, which assumes a fixed size).
I've also got a chip on my shoulder about the "feature" they added that showed the most recently used websites in the iOS app with no way to disable it (they finally allowed setting the number to zero months later). The reps on their forums all come off with this attitude of "this is the best way, and you're wrong if you don't like it" for just about every issue that comes up.
I like the app and will continue to use it, but if my main platform wasn't macOS/iOS I would have bailed long ago.