Since 1.16.1 has forcefully kicked everyone to the new UI and there is no way in Chrome at least to disable updates when sideloading 1.15.6, here is my feedback from use:
The shortcut to open the dropdown category list doesn't work all the time. After pressing tab, the shortcut refuses to work anymore. In order to open the category pane afterwards, you have to tab back over to it and press enter and most times it's just easier to close it completely, open it, and hit the shortcut again, which is silly. I primarily open 1Password X with the keyboard shortcut, so an efficient keyboard flow is a must and months later, this dropdown is still inferior to the prior, easy to use, totally intuitive category sidepane...
The lack of separation between categories in the Suggestions list still makes scanning the list hard. I know you've already refused to add back in the headers Credit Cards and Logins from the previous version, but just throwing it out there that this still sucks.
1Password Version: Not Provided
Extension Version: Not Provided
OS Version: Not Provided
Sync Type: Not Provided