*ahem*
...
True sight CAN indeed reveal someone with non-detection ...
actually, about EVERY detect magespell above lvl 4 or so ignores
non-detection.
Take it from a solo-assasin-mage who thought he found a way to become invincible
Staff of magi is not overpowered that much, the invisibility WILL be dispelled, with OR without cloak of non-detection.
And if you do without the F2/F3 cheesing its just another fun trincket
(sorry if im sounding a bit fanatical, just finished 4 hours of BG2)