Are you forgetting about bitmain, innosilicon, 21e6, asicminer, knc, or blackarrow?
Quoted for future laughs.
Bitfury gen1 chips are capable of more than 0.5w/gh at the wall and blackarrows minion can do it as well.
At this moment there isn't a valid proof of BA doing 0.5W/Gh.
Is there actually any point in time where spondoolies had the best $/gh or w/gh ratio?
How is 0.69$/GH offered in April?
https://bitcointalk.org/index.php?topic=575499.0 I would say that my GB offered the best $/gh and the best w/gh ratio.