In addition, I know the 8800GT is a smoker...my brother just picked up an EVGA Superclocked. However, I wouldn't call out all the stops based upon tweaktown's review...we have to keep in mind that this isn't an official card, and neither are the drivers.
Also, I didn't read the article too thoroughly, but it seems that all the tests were done without filtering turned on. On the last page, they flip on filtering and the GTS pulls ahead by a good margin. I dunno about you guys, but enabled filtering is one of the main reasons I buy a card.