Fiber tank in FX royal 500

Hello everyone
I see the new Daystate Wolverine B , there is a version lightweight because has a Fiber Tank
http://www.precisionairgunsandsupplies.com/mobile/Product.aspx?ProductCode=wolverineBtypeandBLite#PhotoSwipe1408479912044

I have a FX ROayl 500, and i want to replace the metal tank for a fiber tank. i found it in the web
http://www.aliexpress.com/item/Carbon-fiber-cylinder-0-5-L-30MPA-Carbon-fiber-bottle-High-pressure-gas-bottle-Pcp-AirForce/1293315996.html

It has the same capacity, 500cc, and may be is more light. I want to know if anybody knows about this tanks, and if any guy has replace the FX std tank for a fiber tank

thanks