So after a little over 24hrs I've learned a little and been angry a lot.
Of the 9 Sierra's 2 are useless. 1 fails to power up although did power for a short time today, on connecting it to CGminer it immediately gave an error along the lines of 'Main Board 12V error' and crashed CGminer.
Those quality numbers seem to reflect what other customers have been suffering
Out of the 4 BBJets I got, 1 was a dud. And Icedrill had about 25% of their 250 TH arrive not working, so they needed to RMA 60 units.