First impressions Drillbit Avalon 16 boards:
Got my 2 boards today. First tried one, then both. They are powered by a spare ATX PS using a Molex-6 pin PCI-E adapter from a video card to power the second board (the PS had a single 6 pin PCI-E output).
Cooled by a single Cooler Master 12cm fan.
They are 'daisy chained' via SATA cables to act as a single miner (connected the 'Down port' of the 'master' board to the 'Up port' of the second board).
Ran them initially on windows and then on Minepeon (thanks TK for the V8 image and update instructions) with CGminer 4.2.
Need to learn how to modify settings to get a bit more hash rate out of these.
Cheers
Hey Kapobar
Try --drillbit-options Av16:int:825:1:1000. Should get you an easy 22 GH/s. They can definitely be pushed higher too but you will need to make sure you have good cooling.

Barntech
Thanks Barn, I'm running it now on Minepeon, which is a bit more fiddly than on windows (at least for me). For some reason this minepeon build does not accept the oc settings from the web gui, so managed to SSH, get into cgminer, saved the cgminer.conf, then edited it to include
"drillbit-options" : "AV16:int:750:1:950"

(a bit less ambitious than your suggestion, but my cooling is a bit modest now). This works ok and gets about 21 GH/s per board (about 42 GH/s avg for both). So there is room for more performance.
Cheers