I really, really like those traits, as it allows you pour more into raw damage, and then equip less taken while casting and a few PIE into VIT traits as situations need. If there are quite a few of tiers of them that scale well, I can see a lot of mages going for them.
EDIT: Also a huge duh but for dudes that don't use magic attacking abilities (like melees, rangers). PIE-> VIT seems like a pretty sweet bargain, assuming you can eq something similar on those jobs.
Edited, Aug 26th 2010 7:25pm by Tarub
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All bi's are ****-tarts.