Black Arrow is a scam company and stole millions from investors. Do not do business with them. There also is no confirmed X1.5 units that have shipped yet, since they were supposed to be for compensation and BA reneged on sending any compensation to those who got screwed by them.
I was lucky and scored 2x X1.5 units with power cord, wifi antenna, screens for $80.
Theyre a hell of a lot nicer to play around with and the power consumption alongside
my single Rockminer New-Rbox is a hell of a lot more enticing than my first miner
which was a bulky, power hungry monster Antminer S-1.
But when you think of the release date between the S-1 and the X-1 you see why there is that power difference. Most people who bought S-1's achieved a positive ROI, not a single person who bought an X-1 received even half their money back.
You cannot compare 2 generations of miners and expect the power efficiency to be comparable. Why not compare it to the current generation of miners then and say that the X-1 is just as bad as it really is when compared to the S5 or anything by Spondoolies? Not to mention there is soon going to be another generation of miners out and BA could barely ship a few units from their first and only batch without them catching fire.
All in all, the X-1 would have been an extremely good machine had it been released on time with no complications, instead the greedy fucks at BA screwed every single customer they had and are slowly dying out. In reality, the X-1 was finally shipped after other companies had power efficiency ratios of around half of what they did, making them a complete POS of a machine.