Has anyone bought a bike from this guy?

I haven't bought from him, but I can tell you that shipping a bike to a customer violates the dealer agreement for many of his advertised brands. This could potentially impact the warranty on anything you buy from him. Also, I'm skeptical of anyone who claims to sell that many of the popular brands, as the likelihood of any single dealership getting them all is about zero. In short, I would treat this as a scam until you get more information.

A quick Google search for "pedalstock bicycles CA" confirmed my suspicions:
Sorry, I haven't. I hope you find what you're looking for. It's best to buy from physical stores. You can test the bike yourself.