This has been one of my desires to tour this place for the past 20 years. I finally did it, and I was pleased. As stated on the website and in others comments, this is the oldest brewery in the Americas (1829). It is also the oldest US owned brewery as it is still owned by the original family. Unlike a few of the huge US breweries that have sold out to foreign interests. This isn't a large brewery and the tour is only 75 minutes, but the tour guides pack a lot of historical information, anecdotes, and funny stories in that time. Up and down steps quite a bit, so if you have trouble walking stairs it is not for you....do visit the huge gift shop packed with things to view and/or buy. Reasonable prices I might add.
You will see employees hard at work and they seem to enjoy it, especially the humorous brew masters. I have toured several breweries around the world, so the beer tasting is always fresh and delicious. You get two to try, so I recommend the Black & Tan.
I was surprised that there is no visitor parking, but I understand why. The brewery is extremely close ( like 2 feet) to a Catholic church (there is a tour joke about that)on one side, and in a residential neighborhood. Street parking is easy if you arrive for the AM tour. I would advise avoiding the Saturday tour because they say it is VERY busy, and the brewery is not running. We visited on a Friday and it was not crowded at all.
The walk through the caves under the building is exciting and they run horizontally into the hillside. Wonderful tour, great beer in the antique bar, and fun conversations if you engage the tour guides. Great old town, great old brewery.