This was something different, and i did enjoy it but i felt we could have had a lot more facts given to us. We did visit some lovely chocolate shops. Be prepared, they are expensive 0 but mostly very good.
The tour usually costs £30 each but we got it 2 for 1 on the south west trains days out website. I wouldn't pay £30 to do it.
I would say you are better off doing your own research, looking up where the chocolate shops are and spending the £15 or £30 you would have spent on the tour, buying what chocolates you want to try and going round yourself. That way, you will probably get more chocolates anyway! :) As a few stops - you didnt even get a sample and when you did, you mostly didnt get to chose which one you had.