I just had the experience that makes the dongle feel warm and fuzzy. I had an HD crash, and restored from my backup. (4 hours) I plugged in the dongle and went right back to work. No worries about that moment being the very moment the license server goes down for a day, which can happen to any company. (My soft-elicenses did need to be reauthorized, which did work fine.)
Not making a case here against a service like the backup license scheme ilok 2 offers, but man, if I was using that instead of a dongle, and had had that crash a couple weeks ago when the SB authorization server was down, what a drag it would have been.