Since the sphere archetypes of most paizo 6th level casters are a bit lackluster, does anyone have any thoughts of using the Prodigy progression for the bard?

Spoiler: sphere bard
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Proficiency: Sphere bards are proficient with simple weapons, as well as light armor and bucklers. In addition, if this is this character's first level in any class, they may select a martial tradition of their choice.

Casting: A sphere bard may combine spheres and talents to create magical effects. A sphere bard is considered a Mid-Caster. He uses Charisma as his casting ability modifier. (Note: all casters gain 2 bonus talents and may select a casting tradition the first time they gain the casting class feature.)

Spell Pool: The sphere bard gains a small reservoir of energy he can call on to create truly wondrous effects, called a spell pool. This pool contains a number of spell points equal to his level + his Charisma modifier (minimum: 1). This pool replenishes once per day after roughly 8 hours of rest.

Blended Training: A sphere bard gains a combat or magic talent every time he gains a class level. Sphere bards use Charisma as their practitioner modifier.