The two best visits in Montalcino and Chianti Classico were head and shoulders above the rest: Uccelliera and Sestadisopra. Other excellent visits were Valdicava, Siro Pacenti, Felsina and Fontodi. My least favorite visit was Ciacci Piccolomini. It wasn't terrible, it just had a commercial feel compared to the others, which were small and intimate visits. Ciacci even has a US style wine and gift shop.