The Golden Princess's Grand Meditteranean cruise was the best cruise I have ever been on. The ship was great with loads of things to do (Miniature Golf, Paddle Tennis, and Basketball). I have heard people say that they had to wait for long amounts of time for Personal Choice dining. On my cruise, i was with a group of 12 and we had personal choice dining. The reason we chose it was so we could have dinner at 6:30 instead of at 6:00.
This enabled us to have some extra time every night after our tours. So my advice for personal choice dining is to have a reserved time every night and you will be able to cruise right in. In my opinion, the only functional purpose of Personal Choice dining, is to eat dinner at a different time than the normal dining room. Overall, this is the best cruise I have every been on.