Cask Strength Whisky is a beautiful thing. You're guaranteed an intense flavor experience. Also important is that you can decide how much water you want to add to your whisky, instead of a distillery company deciding for you at the time of the bottling. Water will loosen up the oils that provide flavors in the whisky, and you have full control over getting the balance just right.
These whiskies are bottled exactly how they came out of the casks where they were matured, and are almost always 50-63% ABV .