Related thread: When You're Smokin' What are You Drinkin' and Listening to?
Finally got around to trying that Zing-Zang. Took a large bottle of it to the Memorial Day BBQ, which was a big hit and was drained in no time. I liked the flavor better than Master of Mixes 9 Pepper, but the heat wasn't quite enough for my tastes. Found adding a healthy squirt of sriracha or a single drop of Dave's Temporary Insanity sauce added the perfect amount of heat for me.
Along with Q, hot sauces are another passion of mine and this is powerfully good stuff a buddy recommended a few years ago: http://www.amazon.com/exec/obidos/ASIN/B0000DID5T/tvwb-20 A bottle lasts a long time, because a little goes a long way.
I'll be sure and grab some, it's a pricey sauce but if it lasts a good while then that will more than make up for the cost.