A really good, (aged, mature) port is even better than a Madeira (and a good aged Madeira is excellent); the older a port is, the smoother and softer it becomes, less fruity but a lot more mellow. A superb drink to sip and savour.
Yes, as it happens I've tasted Dow's 1977 vintage port (in fact I've even been gifted a bottle). First reaction? Woah.