Three bonus feats at first level seems like a lot.

I understand that Invisible Spell and Eschew Materials are mostly flavor over anything, but still. 3 feats is a lot.

Free Silent and Still Spell at level 4 is also pretty insane.

You should stipulate that Invisible Spell, Silent Spell, and Still Spell all don't count as metamagic feats. Otherwise, this class becomes a favorite for Arcane Thesis abuse.