We hired Webster for the Falls tour and he was excellent.  We started with seeing some of the surrounding area and the Baobab Tree.  The tour went about two hours and Webster knew quite a bit about the history of the Falls, and answered every question we could come up with.   It was very leisurely and fun and ended up with lunch at the Shearwater Cafe.  He also booked a sunset boat tour on the Zambezi for us.  One thing to note was that a lot of businesses in Zimbabwe want American cash rather than credit cards, in addition they want new bills.  We tried to pay a bill at a bar with a 2003 bill and they wouldn't take it.  Their old Zimbabwe money is worthless and they think old American money is worthless as well.