The first bike tour I did was with Bicycle Adventures. It is a high end tour with nice hotels and sit down meals. Personally, I wouldn't do another one.

The main reason for this is that it is a van-based bike tour. We started each day (after breakfast) piling into a van and driving to the starting point. Some people would start there, others were driven further. We ended each day in the van getting driven back to our hotel for the night.

As it turned out, I did this tour the weekend after 9/11 and only half the participants were there. Still, the van felt crowded and the driving time was not enjoyable. If all the people signed up were there, it would have been unpleasant.

If you do decide to do a supported tour, make sure exactly how much time you will spend on the bike and how much time in the van.