I'm not impressed.
I have always used Nvidia graphics cards in my regular desktop but stuck with ATi low profile cards in my HTPC.
The little HD 3470 I had was nice (but worked best with the driver disk that it came with, I found that updating to the then latest drivers caused it to go nuts stretching the screen size beyond my LCD TVs size.....although in the properties it always claimed to be set correctly @ 1920 x 1080).
Maybe I should have taken that as a warning?

I recently moved to a low profile 5670 which seemed to offer everything I needed (esp offering genuine HD audio & a nice single HDMI connection to my Onkyo 875).
It looked to be the most powerful low profile card out there and @ a nice price.
It took an age to get the HD audio working, messing around with drivers and such like.
Now I find that everytime I do anything on the HTPC (something as mundane & ordinary as clicking the mouse to open Outlook Express for instance) the machine looses its 'lock' to the Onkyo & gives me a blank screen for a few seconds before the image returns.
The PC is doing the work I ask it to ok but the image output is almost always lost for a few seconds.
Yes it is something I can put up with, I can play films properly all the way through without (I'm presuming HDMI handshake issues) but it is so annoying.
The card has impressive specs but ATi's drivers blow, terribly.
I know it's a bit late in the day to realise this and I agree its no help saying so but the contrast to the Nvidia 1gb GTX460 I also installed recently to my desktop is so bad.
The Nvidia just works, like every Nvidia card I have owned (and I have had several) it always has done and doesn't need me to mess around for an age reading up on stupid work-arounds to do what it promised.
Hopefully AMD will sort out this lottery, it's one thing to appear to be competitive with your main rival it's quite another to sell cards which are such a PITA to your buying customers.
.....or maybe someone knows of an equivalent low profile card from Nvidia that would just work properly without the messing around the ATi one seems to demand?