Unilux is a premium wood and aluminum clad product that we in the US would associate with quality companys such as Marvin. For premium vinyl check out the products there from Gayko. See http://www.gayko.de
Hope this helps.
FYI- Unilux is made in the oldest village in Germany. It was established by the Roman Empire. The oldest window company of continuous operation, established 1728, still operates somewhere in Germany. My memory is not what it used to be so I can't name the town or the company. Also, If you want what we call a french door or window- make sure to call them no-post and don't call them French!