It increases a psionic character's abuse of the action economy immensely. Okay, not ALWAYS immensely, but in the right situations, yes.
Let's take my current shaper/constructor 11. He can manifest a 1 pp ecto protection as a swift action (manifested in the same round as astral construct) Linked with astral construct which doesn't need an entire round to manifest (and yet it appears in the same way, at the same time), he uses a move action to renew his psionic focus, then tosses out a standard action entangling ectoplasm Linked to another astral construct, which appears in the same manner as the first.
Voila, he just manifested 4 powers in one round, two of which were astral construct, both of which are, essentially, Quickened, and it not only just cost 2 additional power points, but both powers I Linked them to are, in and of themselves, useful.
Now, imagine what happens when you toss this on a psychic warrior? You use your swift action (on, say, grip of iron) Linked to another buff (let's say expansion), and use your move and standard actions to move and attack (or full attack). Next round you have two buffs up, and it didn't affect your combat viability at all.
Very very very useful, and far better (in my opinion) than Quicken Power, if only because it doesn't cost nearly as much.
It also forces the second power to go off in the second round, regardless of manifesting time. Now you don't need to spend a psionic contingency on that psychic reformation, and you no longer have to spend 10 minutes on using psionic minor creation to make that plant-acid you need right now.
