1passwd is pay once use anywhere, but they do charge separately for the app and pc versions. If you have 3 macs, you only pay once. If you have a mac and a pc, you have to buy the mac version and the pc version. But you don't have to pay more than once for each version, which is better than roboform.

roboform's license is per device. You need a separate license for each pc.

lastpass does seem to have the friendliest licensing terms. But the paid services are a subscription plan which is ongoing. It's cheap at $1 per month billed annually, but you have to keep paying if you want those services.

-David