Benjamin Olson
Hero
Most these feats seem balanced to charge you a premium for getting sought after features you would have to multiclass into another class for for 1-3 levels to get, or to make a member of that class take an otherwise impossibly large number of the class' options. They will be plenty popular without being half-feats (in fact I can't imagine rolling a Sorcerer and not taking Metamagic Adept sooner or later).