Not really though, as it’s nonrecoverable.
Healing 25% health is nice because if you then lose some of that health - say, 5% - you can still regain that and more at any time via ADCtH, an on-demand heal, passive regeneration, or some other proc.
Receiving a ‘shield’ of 25% health is merely a buffer that, once initially partially depleted, serves no further purpose. It’s nice that it ‘protects’ your health pool, meaning you can theoretically use any of the aforementioned means of health recovery to carry you further, but it must not be confused as a heal in and of itself.
As Norzan explained, because 2700 health is a cakewalk for tougher foes to break through, it is unlikely to remain up for very long at all, especially if you were already thrust into a situation that made the skill proc in the first place.
+1 to improving T3’s, though it doesn’t seem relevant to this thread.