stoptech is a legit brand. They make a very nice ($) aftermarket brake systems and are an OEM supplier as well (
http://www.stoptech.com/OEM)
Consider buying direct from stoptech to make sure its the genuine article....
Personally, I would skip slotted and/or drilled and just get "blank" rotors (i.e. the ones that are a solid piece of metal, like OEM.
Also, I guess it is too late now, but what are your goals for the brake rotors? I think low dust is likely the only advantage of those pads....