The Pro Series beer kits have been developed in conjunction with professional brewers, using their own award-winning beer recipes.
Surly Brewing Company is the fastest growing brewery in the US. Their beer is so popular that they recently had to stop distributing to anywhere but the Twin Cities to keep up with demand there. Bitter Brewer is not your typical bitter but a rather sessionable American/British ale with a quite a bit of hop flavor and aroma. Normally available only as a seasonal offering from Surly Brewing.