The first port wood finish I tasted was the Glenmorangie. I figured that since they were so famous for their finishing, it would be pretty good. I was distictly underwelmed, and figured that unlike sherrycasks, I didn't care for port influence.
I have since had several wonderful port casked expressions. The Balvenie 21 was exceptional. The Port Port Ellen (Signatory) is really worth seeking out. Pike Creek Canadian has an interesting port influence as does the Bushmill's 16 three wood. At first I really liked the Auchentoshan triple wood, but it has since gotten old on me. Another of my favorates in the Midleton 26yo Pure Pot Still Irish, bourbon and sherry casks that were then port finished. A gamble that really paid off IMHO.