Can I get some experienced insight

Long story short I am looking to get into a B8S4 and i have been following the community for awhile. I got into a debate on these headers and they are a Chinese knock off of eurocodoes which seems to be like a quality rep of super sprint, i think?

Anyways they even go as far to steal pics and description from eurocode. I have never had good experience buying cheap Chinese crap like this.

Can someone tell me from a technical perspective why these headers suck. From what i have read the B8 S4 does not have any gain from headers even if you have every other mod.

I just wanted to hear from someone experienced and knowledgeable which is impossible to find on audizoo.

TIA

http://s.aliexpress.com/uimieAfY