Soulbound Allegience: Build Up Proc in Controller Pets

How does this proc work? Does it have a chance of firing when you summon the guy, or is it a random chance every X seconds to go off? Also, does it effect you or just your pet?

Also, is it worth investing in this IO, as I've noticed blueside that Soulbound Allegience IOs are fairly affordable and it's a pretty decent set.

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You want to know the secret of the world? It's this: Save it, and it'll repay you, every second of every day.
@Dr. Reverend - My DeviantArt Gallery
Crow Call - Gods of the Golden Age

i have put it in my Phantom Army
it has a chance to fire when i summon them and after that it has the chance to fire each attack each decoy fires and it stacks itself (had up to 4 fired procs on a single decoy)

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Helge corr lvl 50 rad/cold
Helge2 corr lvl 50 ice/rad
Techbothelge MM lvl 50 robo/dark
Helge Mauz def lvl 50 emp/ele
illuhelge troller lvl 50 illu/rad
Wiederbelebter helge nk lvl 50 bs/reg
Maennerschreack nightwidow lvl 44
Quantenjaeger ws lvl 3

Nifty. Sounds handy.

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You want to know the secret of the world? It's this: Save it, and it'll repay you, every second of every day.
@Dr. Reverend - My DeviantArt Gallery
Crow Call - Gods of the Golden Age