Yes! My two thumbs just arrived in Southeastern Michigan. I've got them plugged in and I'm playing already, initial impressions seem good. Now... if only my boards could arrive before I leave on Saturday... Looks like I may have to leave detailed instructions for the roommate on assembly so I can play from half way across the world.
Update with performance pr0n:
The speeds seem to have stabilized here after about ten minutes of running, they'll bounce around by maybe 75-100mh/s both up and down but by and large are just what you see here. As I type this the HW errors are still at zero, and the heatsinks (with a fan pointed at them) are just perceptibly warm to the touch.
I'm using these options at the moment: --drillbit-options ext:250:1:950
The forum post about recommended settings says the recommended clock range is only up to 230mhz, but up to 300 is "possible". I took it in 10mhz steps up from 200 to the 250 I'm using now, started seeing errors (especially on one thumb, which was 100% errors) around 220, then pushed the voltage up to 950mv and it has stayed stable all the way up to 250. I may be able to push higher, but I'm honestly a little scared to try it. I don't want to burn my thumbs out on the first day.