Lol!! Spot on man! He had it coming. Some of these guys advertising stuff don't take a dive in it first. Really, it would be a lot easier if they don't promise heaven and earth in something they haven't even used before probably because they're just traders or they cannot afford it in a way, which is the same thing anyways. They're just traders. Rather state its use and give medical proofs to show it works.
Personally, when something sounds too good to be true i observe it for a while or totally steer clear. And no, i don't buy stuff in buses, not even pen!
Good one here bud'