the 680 is impressive in a few areas
they added some decent features that might actually serve a purpose
and they supposedly are faster than a 7970, but also very small, sub 300mm2 vs the 7970s 365mm2

the unimpressive part
is that it took so long
and that the performance gain over 7970 is psudo (as in the turbo feature is used vs a stock competing part, while OCed it gets smashed). this will require a review or two to find out the case.