I would have bought this box for the cards to add to my favorite game, Notre Dame. They are a must have. It was well worth it as I did already have San Juan and Witch's Brew. I've since picked up In the Year of the Dragon and plan on getting Puerto Rico. All of the expansions for these games are very good and I highly recommend getting this even if you only own 2-3 of the titles.
Get this while its available for the San Juan and Puerto Rico expansions. Princes of Florence is out of print, so its expansion is useless unless you've been collecting Alea's games for some time now. If you happen to have the other Alea games, there are some fair expansions here, but I'd recommend buying Treasure Chest while it's still available if you're a San Juan and/or PR fan and games owner.