That is the question!
Specifically asking about a favored soul caster.
Full metamagic enhancements (assuming Maximize, empower and heighten) cost a whole 16 action points, and their maximum return is 15-29 sp. (Asuming you use all at once, at a level 2 spell like sound burst, which, by the way, you can get as an SLA from Epic Destiny).
Spells that might be used with metamegic, and SP saved are:
Soundburst : 14 SP (with heighten)
Searing light : 15 SP (Max and empower)
Holy smite : 10-25 SP (Heighten only or height, max, empower)
Slay living : 8 SP (With heighten)
Flame strike : 8-23 (Heighten only or height, max, empower)
Greater command : 8 SP (Heighten)
Divine Punishment : 15 SP (Max and empower)
Cometfall : 6-21 SP (Heighten only or height, max, empower)
Blade barrier : 6-21 SP (Heighten only or height, max, empower)
Undeath to death : 6 SP (Heighten)
Destruction : 4 SP (Heighten)
Fire storm : 2-17 SP (Heighten only or height, max, empower)
So now that you've seen the raw numbers, tell me. Do you think it's wise to invest so many AP into efficient metamagic, or should I spend it elsewhere? (It's not like there's nothing to spend AP on as a favored soul caster)
Your thoughts?