This tour was great - included the two things we really wanted to see (the terracotta army and the Hanyangling Museum) and we also got a great lunch and a visit to a local farmer's "cave house" which was an interesting insight into how people live outside the big cities.
Michael is a great guide, he speaks very good English and is very knowledgeable about the history and background of the archeological sites. The car was very comfortable with a good driver and plenty of water available. All in all an excellent tour, I highly recommend this if you're visiting Xi'an - you'll have a great time!