Definitely my favorite mezcal I've tried yet and fairly inexpensive by comparison to other brands. Good "artisanal" mezcals are generally well over $60 a bottle, so this one gives you a lot of bang for your buck! As a whiskey drinker, I like to think of mezcal as the high-end scotch and tequila as the middle-shelf whiskey that I don't mind pulling out when friends come around.
Mezcal and tequila are closely related (technically tequila is a form of mezcal). The primarily difference between the two is the method of production. Tequila is made by cooking the "pina" of the blue agave plant, then shredding and fermenting it, etc. (that's simplified but I think you get the idea).
Making mezcal is much more of a "hand-crafted" process that dates back hundreds of years. Tequila can only be made with the blue agave plant, while mezcal uses all kinds of different agave varieties. The agave is cooked underground in a pit lined with volcanic rock. The agave is cooked, smoked and caramelized over several days. Obviously, there is more to the process, but that should give you an idea how the flavors may differ from tequila (read "SMOKY").