The unseen seer's key atributes are as follows:
3/4 BAB and full caster. Not a common sight for wizards prestige classes. Only other one that comes to mind is Sacred Excorcist.
6+ int skillpoints. Also almost non-existent on full-caster PRCs.
And most improtant of all, ADVANCED LEARNING, ADVANCED LEARNING, ADVANCED LEARNING
Hunter's Eye is great, but so are Improvisation, Guidance of the Avatar, and Find the Gap.