IIRC, there's only one official Sig-Sauer P226, however it's still unknown if it's actually the KJW. There are some distinct differences between the two.
http://www.wgcshop.com/pcart/shopper...FMCV_srch_P226 (KJW version)
http://www.sigsauer.com/Products/Sho...&productid=177 (The official Sig Sauer one, it might be the same, but it does indeed look different, plus the MSRP is really out of whack if it is.)
If it IS the KJW version, then it's the usual Taiwanese knockoff that's cheaply FMU'd. The KJW marking ones are a bit better than their last efforts to manufacture knockoff GBB's, yet it's still a knockoff and certain problems with their pot metal components still arise. The safety/takedown lever is known to wear down, and once again, hammers are still known to wear fast and of course, incompatibility with existing magazines.
They're okay if you want a cheap FMU handgun.