I think it looks promising, for anyone considering a cloud-based and e2ee password manager. But I wish it had launched with a desktop app; that makes it a no-go for me currently. If it really doesn't have Yubikey support, that's also a no-go.
Also, when the current offer expires, the price will become 5 USD per month, which is vastly more expensive than Bitwarden's personal plan (which I currently use). Yes, I get a big discount if I subscribe before the end of July, but long-term it's not a great deal, and currently not a competitive price.
I used KeepassXC for years and I love it. It has all the features I need from an offline password manager, but the inconvenience of manually copying the database file to my phone whenever I updated it finally made me try out online password managers.
I think if Keepass/KeepassXC works well for you, I see no reason to switch. You can always try the free version of Proton Pass in order to compare.