We chose three of Tong's standard tours: Bangkok by public transport; floating market, train market and fishing village; and Ayutthaya.
We had three different guides, Nang, Lillie and Charlies all of whom were excellent. Friendly, knowledgeable with good English. Best still they were all flexible, so they did not insist on sticking to a particular itinerary and suggested alternatives, some of which, such as Charlie's diversion to see a colony of fruit bats, turned out to be higlights.
Before we went I wrote to most of the guides recommended on Tripadvisor. Tong's response was the most comprehensive and one of the cheapest. It is easy to see why Tony is number one guide company in Bangkok!