But with the +10 EVA it makes your stoneskin last much longer than fighting in Refresh gear, if you are soloing.
Look at this video: http://www.youtube.com/watch?v=CP2vVsDrk_I&eurl=
TARU WHM soloing Sabotender Bailarin....with gimpy /THF!
I solo'ed TONS of Gigas in Beaucedine, and clearly, while Noble tunic gave me +1MP (I was gimpy /THF too.....) I got hit every other hit or so and had to recast stoneskin in the middle of the fight. (Cuz WHMs can't kill stuff that fast ._.) With Reverend Mail, I went 2-3 Gigas without a recast because I will get hit only once or twice a fight. So in the long run, Rev. Mail saves more MP.
I'd say if you are concerned about soloing and running out of MP, bring a Yag or a melon juice or two. You can swap in refresh gear while you're moving around, and with /SMN and Sanction Refresh (in ToAU) you can have more than enough MP recouperation.
WHM soloing takes more preparation and thought than most jobs, I think.....collect and dusting off the melee gear (life belt, genbu shield, Ruby Rings, Rev Mail, Pineal Hat (so I don't have an O hat), Morgen, spike neckless, HP earrings, Fenrir Stone....), melee food, MND stuff to swap in for stoneskin/enfeeb casting, refresh juices...no wonder I solo as SMN!