"Some guy" was selling it at a gas station? It's GOT to be good! LOL Just kidding with you but I've never heard of it. A quick look online and it seems to be some pretty cheesy stuff.
It is GREAT stuff!! but know they can always negotiate on the price. I got 5 cans for like $25, no the $10 each they try to charge.... it is good on glass too... i wouldnt use it to clean a dirty car like the guy tries to say (it would end up scratching the paint) but it a good show polish, quick and easy!
Never really had any desire to use aerosol products on paint. Maybe wheels and trim, but even that is an ultimate last resort. With that being said, I haven't used this product so I don't have an actual opinion on how it performs.
Some guy did the same to me as I was filling up after a fresh detail. He wanted to show me how it worked on my car....really..... I asked him if it looked like my car needed to be cleaned and he looked it over for a minute and walked away haha.