I tried using tripadvisor, but it requires me to sign in with a facebook account, which I do not want to do.
But here is our review:
"My wife and I had a very pleasant vacation while in China. Our guides were all very knowledgeable about the local and broader areas we visited. They also accommodated last minute changes in the itinerary, which pleased both of us very much. Pickups and drop-offs for all hotels, airports and rail stations were prompt and efficient. We look forward to visiting new areas in China and hope to return soon."