What is Soileau's? I see they make some kind of sauce as well as this spice. Is it a rub, cajun spice blend? Spicy? 
I guess I'd call it a Cajun spice blend. I like it better than GP (here's where I duck

). It contains no MSG or sugar and the first-listed ingredient is cayenne; yeah, it's spicy.
It's a small family operation (Avery Soileau, wife and kids) and is available only in IL.