Curious about it too. I think I read that it did not have an external power connector meaning all power is provided over the PCIe slot itself. I suspect that will severely limit what these can do. But wouldn't mind hearing first hand reports.
I recently decided to experiment with the 550/560 2 and 4gb models. vI had 2 560 4gb, 1 560 2gb, 1 550 4gb, and 1 550 2gb.
Not only is it a very profitable coin, but it also, in my opinion, will start to spike up in the next months let alone years so it works well for me.
The hashrates are roughly the following:
550 2gb 85-90
560 2gb 105-110
550 4gb 115-120
560 4gb 130-136
The reason I even purchased them was because I had a few extra mobo's and cpu's etc at my house,and the electricity is is pretty damn low. Not to mention the insanity of prices for all decent mining cards lately.
And I felt this was a great hypothesis to test because I mined with them for 29 days and returned them on day 30

Still profitable even with top tier electricity, but it was more just for kicks