Re:6 Player Puerto Rico
We played the 6-player variant yesterday and the finesse and fun of the original game is still kept. The game took 19 turns to end, due to a shortage of victory points. There were at that point only 5 colonists left so it might have ended that way as well.
We all feared an increase in downtime but that did not occur. The main strategy problems however that occur in a 5-player game, are even more clearly present. Expect to be the starting player about three times. This is too little to have a strategy based upon this. So get the best out of your opponents role picks.
Quarries are still very important so consider buying a building to get them. Also make sure you get cash from other places than the trader. Chances are high that when it's your turn to sell, the trader's house is full or you don't have the correct good to sell. The factory filled this void very well in our game.
The wharf still remains interesting. Not only for its well-known reasons but also because you will be faced with full ships several times.
The game ended with scores ranging from 42 to 65. The winner had a factory to generate his money and had a good tabacco production which generated most of his points. To get the most out of the factory, he produced exactly one of all other goods, except coffee. This made it possible to have two large 4-point buildings in the end, assuring his victory.
This 6-player variant is very good and even makes me think of making the extra parts you need, myself.