I have been to China on business but never for pleasure. Will be taking the family for an sightseeing visit. Looking into various organized tours but found information on the hiring of private guides in various cities. The private guide option seems extremely reasonable cost wise ($100US a day for a family of 4) and provide great flexibilities. I have zero experience with private guides anywhere in the world and am curious, are their services widely used? are they reliable?

I assume you have to hire a different one for every city you visit and supply the rental car if necessary. Any information is greatly appreciated, especially information on how to find reliable ones. Safety and reliability for my family is my #1 concern.