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. Despite this, Surly Furious is ranked number 28 on BeerAdvocate's top ranked beers in the world. Recommended: 2-stage fermentation and yeast starter.