The user interface is clean and intuitive although the change in theme from a colonial Puerto Rican plantation to a WW2 factory is strange, especially because the workers were changed into gears, it is a great implementation. Tropic Euro is excellent for beginners because if you never played a game that has variable roles and phases, Puerto Rico can be overwhelming unless someone shows you how to play--that someone can be the Tropic Euro AI. If you are a veteran Puerto Rico player, there is something for you because, Chris Gibb implemented new buildings from the Alea Treasure Chest expansion as well as "patched" the imbalance of the Factory and University. Andreas Seyfarth, Puerto Rico boardgame designer mentioned that he wanted to reduce the cost of University by one and raise the cost of the Factory by one. This would make the University, an unpopular building, more attractive while reducing power of the slightly overpowered Factory. Furthermore, the AI is tough enough to keep you coming back for one more game. Tropic Euro is a hosted Java game that you can play online with people or with the AI. Tropic Euro requires an account but is free to register.
PS Chris says that he is working on an offline version.