Limited use given the cast time but you could manage a ghetto canni-dance of sorts. Chain casting would not be wise as you'd miss out on a med tick that's more or less as much mana as the robe would give at the cost of 60hp.
Situationally, it could be useful if you really need more mana in for critical short term purposes, but for general use seems like a wash. Assuming you don't have a pocket healer or a big external regen buff you're looking at 10 ticks sitting to regen back one click of the robe.
Necromancers who can self heal are still looking at a hp:mana ratio of 3:1 ... our best lifetap dot ratios are less than 3:1 so it's a wash unless you have an item click (vp staff or wiz epic for wizards).
Of all the classes that can wear it, enchanter is probably the class that benefits the most.
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