Eat before going. :-)
Generous tastings (6), enough you might get a buzz, especially if you didn't eat beforehand. Book at least 3 or more months ahead. No weekend tours. Totally worth it and its free!
10am and 1pm tours...they're pretty booked usually 2 months ahead...but you can call a week ahead to check for cancellations. 1.5 hr tour through facility and a tasting of their 7 current beers on tap (~2 pints)