The sad thing is that when they buffed cures, they made regens really pointless on WHM. A Cure IV typically cures like, 900 HP for 88 MP (You also get a bunch back from pentaloons), and regen IV with Briault+2 and Mitts+2 gets you 925 HP over 75 seconds for 82 MP. It's basically only useful as a safety net (Hoping a tick can save someone if you're busy casting something else, that sort of thing). They seriously need to fix Regen spells for WHM.
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Is hachiryu haramaki any good for it?
Not really. I guess if you don't have the usual choices (AF3, Thaumas) it's a good thing to use as a holdover if you just happen to have it.