I went on the tour last year with my mom and it was a fun activity. Their chocolate is made in Mexican style and has a more "grainy" flavor/texture to it, which some people love and others dislike (I like it). All of their chocolates are "dark" chocolate and are vegan. Also, their chocolate is "slave-free" -- they work closely with their cacao farmers in Latin America to ensure they are farming sustainably and treating workers well (unlike most of the big chocolate manufacturers who often buy cacao from the Ivory Coast where child labor and slave labor are problems).
If you like chocolate, you should definitely try it. They also have interesting flavors like ginger. Veggie Galaxy uses Taza chocolate in some (maybe all?) of their chocolate-type desserts.
Note: I understand Taza makes only vegan chocolate, but they may sell to other companies that make non-vegan candies (which they may sell in their store), so be sure to read ingredients before you buy.Pros: worker-friendly production, sweet chocolate!, sustainable production
Cons: a little expensive (because they care), some people don't like grainy texture