This is one of the best tours I have ever been on. The master balsamic vinegar maker gave us a guide around the premises, full of interest for his subject, information he passes on to visitors with ease. The process is fascinating, especially if you have ever seen how wine is made (totally different), and the tasting opens your senses up to the subtle differences between the vinegars.
Seriously great tour, and well worth the trip out from Modena.