It's a 5th circle spell, and lost its unique, major functionality in favour of ultravision, an already existing, 2nd circle spell.
It's the cleric's only seeing option without certain domains, but even wormsight is just a circle higher, instead of 3 circles higher.
I think it would be worth its spell slot if it was hour/lvl, or at least 2 turns/lvl.
As it stands, it's just flashy see invis, and is actually worse for GSF:Diviners, because it doesn't have the double duration of See Invisibility.
Keep it the same but add +15 spot so its a kind of C&C
Trueseeing getting longer duration with GSF DIvination would be pretty cool.