I did this Biodynamic tour for my 40th Birthday with the other half after reading much about it whilst we were researching our trip. I can honestly say it was the most excellent tour and one of the highlights of our 8 days in California.
Our guide was so hospitable, made us feel ultra special, took great enthusiasm and shared so much knowledge and expertise her passion made us passionate about the place. We did the full tour which I think is well worth the price and the visit to the cave really is special. The place is scenic and very clean and well kept with a lovely atmosphere.
If you are short for time and narrowing down to 3-4 Vineyards as we did then Benziger should certainly be one to include.