The first thing we need to really determine is from a gaming perspective, what kind of user should be looking at this card? That's pretty easy really. If you're on a 22" monitor or smaller, don't game heaps, happy to use medium detail or lower and you don't want to bust the bank wide open, this is a great card for you.
The other people who will really like these cards are ones who want to get in on the EyeFinity action from a desktop real estate / productivity perspective. Due to the budget orientated cost of the card, it's a great option for people who want this kind of setup.
On the bad side of things, performance in games isn't fantastic when you compare it to a lot of the cards we look at. In saying that, though, you can expect only so much from a card that is $99.
We've got to put out a warning on this model; there's going to be a large number of variations of this model and we'll no doubt see companies use GDDR3 memory instead of GDDR5. This is going to put quite a hit on performance. So if you go hunting for a HD 5670 and you get excited by the low price of a particular one, please make sure you look at what kind of memory it uses.
Some of the other variations will include companies not including the CrossFire connectors. While CF will still work, it will be a software option. How this will affect performance, we're not sure, but it costs less for the manufacturer so it will be a cheaper price.
There's also word that we'll see EyeFinity versions of the card which will carry with it six DisplayPorts which will be another great option for people who just want a heap of monitors but don't need the graphics card power.
The HD 5670 is quite an impressive model. It opens up EyeFinity to more people and it gives people who want to jump to a HD 5000 series card on the cheap a good option. But remember, we can't stress enough that if you're happy with the numbers you're seeing here today, make sure that you look at what memory is used on the HD 5670.