Excellent, the benefit of beating the line if you book early in the day means you can make a bee line for the best bits (Sistene Chapel) and see it before the crowds gather. There are of course lots of other wonderful things to see as well.
Really good, especially the Colosseum. Our guide Agnes had a good handle on Roman/Italian history, so by the end of the day there was a bit of information overload setting in - which is no criticism of her, she was bubbly and amusing to the end. Be prepared for a lot of walking.