We chose Ron from reviews we'd read and were not disappointed! We were a group of 5 (one of us a visiting Aussie) and Ron treated us to a great day. We visited 4 wineries and, even though it was a miserable day weather-wise, Ron kept the day bright for us. He is very knowledgeable about the wine industry and is a home vintner himself. We had great conversations with him.
Two of the wineries were beautiful but their wines were out of our price range, so you might want to mention to Ron if you have a price point.