I feel pretty confident these chips will be very good performers, especially Zambezi, the desktop Bulldozer. I mean look at how badly Fusion is destroying Sandy Bridge? Also consider this is a 100% new architecture from the ground up, so there's no reason to look at AMD's patterns with Phenom to identify performance.
If the Bulldozer chips are 'at least' as good as their mobile counterparts, they should walk all over first gen core i7, and IMO very likely the newest as well.
Numbers don't lie, unless AMD really goofs up manufacturing, I think we may have a real winner here. 8 real cores, 32nm, shared resources, all the old redunancies gone... it just sounds perfect. Also consider what's been said that, these dual core-modules perform only 6-8% 'less' than a native dual core. Using that math, you could easily suggest a minimal performance increase of 33%, but as we know it absolutely must be better than that, with shared resources, faster memory, larger cache, both L2 and L3.
I don't mean to try to sell AMD here, but I see no reason not to think these things will be very competitive, especially consider how mean the Fusion APU's are. They obviously got this right, 6 years in the making they'd better.