Very informative. Seeing its performance side-by-side with the 5750 was a really good comparison -- honestly, at this price, even if I was concerned about power, I'd rather just spend the few extra bucks for the 5750.
The 5670 will probably find a niche somewhere, eventually, as the cheapest and lowest-power DX11 card on the market, but not for a year or so and not until the price comes down. Probably it'll be the same idea for early dual-core systems as the 4650/4670 AGP cards are for aging Pentium 4s.