Over the years, they have been very similar base beers. They range in color from a darker amber ale to a dark brown ale. They range in ABV from around 5.5% to over 8.3%.
Most have had non-traditional beer flavoring. A couple have simply been base beers.
The very first one (2009) was an extract Brown Ale at about 5.7% ABV. Along with the extracts, the beer had Cherries, Honey, Almond Extract, Vanilla Extract, and Ground Cloves.