I've been using the production version of Valt on my Mac and iPhone for about a month now. It's interface is clean and simple to use.
I'm excited for integrations to migrate existing password bases over!
The mac application has a simple verification process through the iPhone app which I found really neat. Overall its a great launch, and I'm excited to see the product mature.
It's not quite as well integrated into my flows as say "Google Passwords" but that's a matter of time and use. For the true security folks out there, this is more secure than a passphrase and easier to remember.