I wouldn't say TEIN is a fanboy brand. I've been using TEIN for years (except for the Ohlins in my Mirage, but used TEIN upper mounts for it), and I'll say it's the most cost-effective set that I'v ever used. I also had some TEIN basics that I sent out to get revalved to an adjustable like the SS.
In the other hand, K-Sport and Function/Form are fanboy brands (well at least the newer F/F are coming from a different chinese manufacturer now). K-Sports, FF ver.1, D2 came from the same chinese factory in GuangZhou.
But I wouldn't write off the Koni/GC combo. It is a good setup if used with their extended upper mounts.