Charge Mastery: Electric Shackles question

My Thugs/Poison just hit lvl 41 and I'm looking at the electric shackles power from the charge mastery set. Is it a good hold power?

Looking at Red Tomax from the paragonwiki links Shackles has the lowest duration of the PPP holds (for MMs at least).

The other three have equal duration, but different extra effects.

Soul has the coolest animation, I'd say, but leviathan also has KO Blow which looks like it can (or always) do a hold as well (description says chance to hold, but the power info at Red's doesn't list a chance, indicating it always happens) so Leviathan gives you two holds.

Not particularly. It does decent damage (Damage Scale 1.05), END drain (-7) and -Recovery (100% for 8s). But it pays for those with a the longish cast time (2.376s in ArcanaTime) and DoT (6.3s for full damage) and a short duration compared to the other MM Epic Holds (which vary from 11.92 to 17.88s in duration). The -END/-Rec isn't all that useful and its 8s Mag 3 Hold means it only a 23.3% base up time and isn't generally effective against Bosses since it's too low in Mag to hold them with one application and can't be practically stacked. However, since you're /Poison, you can use Weaken to make bosses vulnerable to it, and it does provide a mezz to take out pesky Lts.