Very, very good selection of beer -- ranging from your everyday case of Yuengling to really interesting craft beers from breweries you've never heard of. They carry a really good and diverse selection of English beers and ciders, including some I hadn't thought of since I studied there in the late 90s.
Nice owner -- clearly knows his beer but isn't judgy or dismissive of your choices at the register, and is just generally pleasant to talk to all around.
Make sure to become a fan on Facebook -- they often receive small shipments of certain beers and announce their arrivals there. They move fast!