There is a website that reviews bike tours.
http://www.biketour-reviews.com/

I do not recommend Len Caplan's Europe by Bike. We got HOSED by him and have the NY Atty General looking into a fraud case against him.

This year we are using ExperiencePlus! to go watch the Tour de France.
I'll let you know what I thought of them when we get back from France.