I'm a cloud 1pass customer, but the UX leaves something to be desired, especially for a cloud app.
When adding an account to 1pass, it's important to click [save] before closing the tab, otherwise it's lost. (Having to pull passwords out of the PW generator history is a hack.) (It does support my belief/their claim that the pw decryption is done locally though.) To be fair, it used to be that you could accidentally click on the left pane and lose the unsaved account - they've fixed that in the latest of the 1PasswordX extension.
I haven't moved my entire life to 1password, so I don't have, eg, my passport or SSN or any outdoor license's in the system, and the inclusion of such things degrades my user experience - imo the new button should make a new login, with a button on that panel/page to change type, rather than making me pick which type of secret I'd like to create when I hit the [+].
I have, however, added my credit cards, but as far as UX, in the main UI, I click on the credit card category, then click on the search and try to search for a website login, only to have 0 results. Not surprising, I don't have an ycombinator credit card, but search results pane could surface hits in other categories if there are zero hits in the selected category - most (all?) of the data in 1 password is text, so I'm doubtful that full-text search is that expensive.
1PasswordX (the obvious chrome extension to install) doesn't work with TouchID without some extra configuring. (I set that for less technical people in my life, and that only came up after asking them why they stopped using 1pass.)
I'll give them a bit of pass on the difficulty of adding accounts on ios, but where many/most websites use email as username these days, maybe that could be autofilled when adding/creating logins manually?
And for my gripe about cloudification - I'm reasonably happy to pay a subscription (I currently pay for one, and am hopeful they're working on ^ UX issues), but every time I add something to 1pass, I question if adding secrets to a cloud/SaaS app, is going to royally fuck me over if AgileBits ever shuts down. Being able to save file-based backups to various places was reassuring. (Yes, this is a UX issue - it's not great if a customer questions if they want your product, each time they make the product more useful for themselves.) (See also: Trying to choose a Netflix title to watch, and giving up in disgust.)
TBC, I'm a (reasonably) happy customer, but I wouldn't hold up their UX as "well polished". I don't use it as a selling point when trying to convert people, certainly. At least I don't have to interact with it for the most part - I click into a password field, authenticate, and click autofill.