Ok, I've been looking at this item on the AH for a long time and I thought it was +30MP not +30 HP like it says here. I'm a white mage so that's why I took interest in it. I guess I should go look again... (O.o)
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~~~~Thoris of Sylph ~~~~~ San d'Oria Rank 10 Job/Level: Whm 75, Mnk 75, Smn 40, Brd 45, Blm 37, War 37, Nin 37 http://www.youtube.com/watch?v=5jtyUMamcts Kills: Jailer of Love, Jailer of Justice, Vrtra, Tiamat, Nidhogg, Fafnir, Cerebus, Hydra, Khimaria, Proto-Omega, Proto-Ultima, Kirin, Suzaku, Genbu, Seiryu, Byakko, Bahamut, Dynamis Lord Progress: Rise of the Zilart O; Chains of Promathia O; Treasures of Aht Urghan, 'Shield of Diplomacy' (TAU22).
I'm a Mithra THF but if I came upon these I'd keep them. They rock at farming and soloing, but I can even see use for these in a pt if you have +DEX gear for SATA then use +STR and attack gear just to hit. Actually, that is ideal for me at least. It doesn't matter much if your SATA hits for a million if your whimpy dagger attack hits for 5. :P This way you can always do optimal damage, just do a macro to switch gear.
STR and VIT are nice and all... but being a Mithra THF, this does diddly squat for me almost. Sure, it'd be nicer to hit a bit harder, but I rarely ever get hit, meaning the VIT and the HP+ are just for show... :/