It worked initially for me, but slowly stopped working on all of my devices. Every time I get an error like "You're signed up for one click access but this device is not associated with a Marriott account" and it tells me to log in. I've tried logging in afterwards, but that just returns a permission denied error page. I've also unchecked the one click access box, but still end up with the same problem. Whacking some cookies is probably the way to go, but the cookie isn't assigned to "marriott.com" and I never remember the domain of the sign on page.

It also does not work across properties, so needs to be set up for each property.

Nice idea, but seems to have some issues for now.