considering it will take atleast 3 ticks, ie, 18 seconds, to restore the mana any caster at that level would use to cast ONE spell.....and the recast time is longer than the spell lasts and much longer than a typical fight in a group. just this side of useless.
would have been nice at lvl 30 or 40, At 75 it is like most of the spells you get every level. something that would have been good 10 or more levels ago, As with 50 to 75 percent of your spells, like the whole focus line, save the money.