German style beer hall and German style brewing. That nicely sums up OMB.
OMB makes several tasty varieties of german beers following the reinheitsgebot german purity laws. Though they are good at making the beers they make, their downfall will be sticking to the reinheitsgebot. Because they follow that, they have a small selection of beer compared to most micro breweries. That is disappointing because I believe they could have a pretty good lineup of beer if they expanded and only brewed their traditional german beers using the purity law.
I also took the tour while I was there and it was informative and entertaining. I tend to travel the world on brewery at a time and am becoming a tour snob. This one does not disappoint. They cover everything a good tour should cover, you get to enjoy beer while on the tour (though it is beer you buy from the beer garden) and the tour guide was entertaining.