Power Boost for Time Manipulation?

Currently I'm thinking about which ancillary or patron power pool I should choose for my time defender. For background story / style reasons I was considering Captain Mako's Leviathan mastery.

Ghost Widow offers Power Boost, though, which could improve most of time's effects (defense, hold duration, slow...). So, I'd like to know: Is Power Boost an impressive addition for a time defender? Does it improve time's performace noticeably?

Power Boost (or Power Build Up) is REALLY good for Time Manipulation. If you use Farsight during Power Boost, it will grant a higher defense bonus for its entire duration, it doesn't drop back down when Power Boost expires. Power Boost is quite nice for your other powers, too, but Farsight is what really makes it great.

For the combination of Power Boost + Farsight alone I'd recommend it.

Power Boost's recharge and Farsight's duration, without any slotting, sync up perfectly. You can get Farsight permanent purely through three recharge reduction SOs as well. As Hopeling mentioned, when you hit PB, it makes applied buffs/debuffs have the boosted effect for the the entire duration. Toggles are boosted as well, but only for the 15 seconds.

Without PB, Farsight's giving you 20% defense on 3 defense SOs. With it, it's around 32%. And that's for the whole team provided they're in range, which is an incredible buff to be giving off. All by itself, it leaves you 13% away from the softcap (5% chance to be hit), and you should be able to easily cover that through other powers.

That's not to mention the fact that it strengthens your heals, most of your debuffs, whatever your primary's secondary effects are, etc. Very good for Time.