| The problem is the cost. It's far more powerful with low level powers than the high levels. The cost doesn't scale with the utility at all.
It's the reverse of the Infernal Pact boon, which is almost meaningless at level 1 and very strong at level 30.
i.e. Warlock with con 14 at level 1= 26 hp, pays 1 hp to re-use a level 1 encounter. That's 3.85% percent of his HP to regain his only encounter power. A laughable choice, a complete no-brainer.
i.e. Same Warlock, level 11= 76 hp. Pays 1 hp, to recuperate his level 1 encounter power. That's 1,32% of his HP. A joke. But if he wants to recuperate his paragon path encounter, that's 11 hp. 14,47%. That's more of a choice. Especially since as good as the paragon path power can be, there is no way it is 1100% more powerful than the level 1 encounter power...
That's just bad. Many feat introduce a new tactical considerations, but I can't think of any that brings such absurd choices to the table.
To bring it in line, it should be proportional. i.e. Spend a healing surge and get back 1 encounter power (1/encounter max). The current write-up is absurd and isn't getting in any of my games. | 
And yet another word from our sponsors
