Quote from LongArm:
Right, if you had bought the FAS/FAZ pair last November, you'd be down only about -83% by now.
How do you get that number?
Going from the spring hi/lo, FAZ has dropped from ~$1000 to ~$20, FAS has increased from $13 to $87. Taking the smallest possible neutral position with the pair would result in...
(87-13)*1000/13 - (1000-20)
for a net change of approximately +$5000.
If you had simply bought $1000 of XLF, you would be at ~(1000/6)*10 or roughly +$1600.