They are experiencing reliability issues which is why Consumer reports said they cannot recommend the Tesla Model S. http://www.consumerreports.org/cars/tesla-reliability-doesnt...
I'm not saying they're perfect in every way. Merely that they're big enough and serious enough that it makes no sense to refer to it as a "hobbyist company" anymore. I could see it in the Roadster days, and the early Model S days, but not now.