Definitely worth doing if you are in any way interested in Ancient Rome - the guide is a wealth of knowledge.
I dont think anyone has ever said they didnt enjoy George's boat! Its by far the best optional on tour! The water is amazing and George is quite the entertainer ;)
14 000 ft! DO IT! It may seem like a lot of money at the time but it is worth every cent! Make sure you buy the video so you can prove it to all of your friends!