It syncs easily across multiple macs, as well as to the iPad and iPhone. I use all of them frequently.
Also, with DropBox, I’ve been on friends computers, logged into DropBox and then into my vault to get all my data. Makes life very easy.
And, finally, I actually make a lot of use of the extra accounts and wallet features.
MacUpdate offers a download of all license keys when you purchase their bundles, which I generally do, and it’s nice to have that information kept secure.
I like that 1Passwords backups frequently and maintains the backups, and how well it integrates across all the browsers I use.
And I like the UI – I use the actual app pretty frequently, and the password generator.
I’m not afraid of DrobBox – the vault is stored encrypted, not much they can do to it.