I haven't, but one nice thing about 1Passwd is that I'm pretty sure that even if you don't use .mac it put your passwords on your iPhone (if you have one) with 1Passwd Touch for use when you're away from your computer.
Overall it looks like a pretty nice app, and I like that it works across browsers and makes it so easy to retrieve your passwords.
I really don't like the reliance on .mac for syncing between computers though. I feel that .mac is totally overpriced.
The good news is that you don't have to use .mac to sync: it works just fine with Dropbox (and I don't see any reason why it wouldn't with other sync system).
To be honest, I don't use the iPhone app so much mostly because I would still have to type my primary password there and it's not convenient on the screen keyboard. Also it uses a custom browser (or a browser element inside the app) and not the regular Safari. That can be an issue for some sites. But I still have it in case I need access to one of my randomly-generated password.
