I believe it has been offered to the public as of only yesterday, so no, I certainly don't know anyone personally running one, it appears the only people running the kit at the moment are people who are close to ZCG. At a glance, I think it's a better kit than what Wolf Creek offers.
Regarding the mustache bar, I don't know if there's a benefit to the aftermarket units available that I'm not aware of, perhaps there is, but it's not on my shopping list. Money better spent elsewhere IMO. Maybe you will expose a weakness of the stock mustache bar with 800hp, but I'm thinking you probably won't with 300 or less. I could be wrong, of course. Regarding the drop mounts, I believe I've heard that the stock ones are a bit flexible, but I think this can be solved with some simple reinforcement. I recall John C talking about this somewhere on here, but I'm stretching my memory a bit.