Many duplicate parts are sold by them, I have used this Fairchild MOSFETs which is now part of On Semi, since all my production went wrong, we removed all the devices and replaced it with On Semi parts and it's ok. They refused to replace it.
After reading response from vendor.
We can prove all fairchild parts sold by them is duplicate, anyone can google to find that Fairchild parts don't come anymore, it's all On Semi parts, they have duped us.
Quality of the product was good, I have purchased stk4392 from them, By watching video in YouTube, Quality of sound is good, Smooth audio output as equal to original SANYO ic quality, There responding to every ping in WhatsApp. Finally price of the Ic is little high but, it is worth to the performance.
Amazing experience. All the electronic components like ICs, mosfets, transistors etc.are easily available here with best prices compared to market. The attitude of owners is great. I totally recommend this shop.