* This is not an endorsement *

I'm as skeptical as anyone but the SiliconArt site is linked directly from the a Gigoptix site...
http://ir.gigoptix.com/mobile.view?c=225697&v=203&d=1&id=1918248
(Sorry for the mobile link but I'm posting from my phone)

I'm pretty sure Gigoptix is a real legitimate business and would doubt they would want to be associated with a scam.
http://finance.yahoo.com/q?s=GIG