No idea why sticker mule got into the hot sauce game but Mule Sauce is real good.  Spicier than Louisiana-style hot sauces (i.e., texas pete) (sidenote: tabasco is not a normal LA-style hot sauce.. tobasco also isn't very good) and buffalo style sauces (i.e., franks).  The flavor is great.. I most closely associate it to a habanero flavor, although there are certainly a multitude of spices going in the bottle.  In sum, not too peppery and not too tangy and just the right amount of kick.

I'm a hot sauce person