Well, I have to put my 2 cents in. It is an All/All belt, yes. Most casters, if they play to benefit the guild as a whole, would pass on this and that shows character - so if you have casters rolling, you may want to ask why you are in a guild with those peeps who aren't looking at the bigger picture.
I do have to say that no one should pass a dirty look off at a cleric that rolls on this tho. I gave my hubbies cleric a spiked seahorse hide belt along with his warrior, not just because it has ok stats but because it has haste. There are a lot of clerics out there that know how to heal and melee and at the higher lvl's clerics can be really nice dps. Add a haste item to that with 15 WIS and you not only have a cleric with more mana (if they weren't already maxed wis before) AND a cleric with more dps. Course, I'd love for my pally to have this over a warrior just because of the high WIS but it's all a matter of preference, and everyone will put in their opinion and is entitled. I did. =)