Er...anyway...something just occurred to me. Assuming the Crab Familiar is a Paladin and thus devoid of all Double Attack and Triple Attack, couldn't a bro or bro-ette just let a Crab Familiar miss a Fortilace for five minutes with Run Wild and then another without Run Wild to easily test Run Wild's rough haste value, if any? Since the only thing that would matter is relative attack rounds, really.
DipperYuly has no Double Attack either. I'm almost positive Run Wild gives some amount of Double Attack. Though i have second guessed myself, as, I may have had the Ferine Necklace on at the time.

That being said, It does Increase Attack and Defense, And if i recall I saw some tests saying it does increase Haste by some value. The Ability is not that bad at all, At the very least it makes your pet quite more difficult to kill.

It has its uses, mostly on cheap jugs or the last 5 minutes of a Dynamis run, or a Short BCNM Fight... But its not a terrible JA.