I had Harpoon 1e and 2e but never played. No opponents and not top of my interest level back in the day. I also have Warship Commander and the supplement Sea Command. I have as many notes in the margins of WC as there are rules. Not a finished set of rules IMHO.
I picked up copies of Harpoon 3e and 4e from the pirate sites since getting back in with the intention of doing Falklands. Still I need an opponent.