Thanee said:
No, it's the other way around. It's great for Wizards and good for Sorcerers.
Wizards gain a lot more from this PrC.
You'll have to explain this.
1) The main advantage Wizards get with this over Sorcerers is for the Cooperative Metamagic and Metamagic Effect abilities. Wizards are more capable of using these abilities. But in practice, these abilities probably rarely come into play for either class.
2) Wizards have one additional feat over Sorcerers, so they have a very slim advantage (hardly noticable) for Metamagic Spell Trigger.
The advantages Sorcerers get with this over Wizards are:
1) Wizards give up two feats to take this PrC. Sorcerers give up 0 feats. Both classes gain 4 metamagic feats, but Sorcerers are more starved for feats than Wizards (having two less, Scribe Scroll and the Wizard's 5th level feat). By 16th level, a Wizard goes from 8 feats to 12 feats with this PrC, but a Sorcerer goes from 6 feats to 10 feats. Normally, a Wizard has 4 more feats that a Sorcerer at 16th level, but here the Wizard only has 2 more feats. Even if a Wizard goes into a third PrC at 16th level (the earliest he can do so and still have 10 levels of Incantatrix), he still will only typically gain one more feat.
2) Without Arcane Preparation or the PHB II shorter duration metamagic for a Sorcerer, he cannot Quicken spells at all. Instant Metamagic gives him an ability that he could typically not previously do (and he could still combine it with these other two abilities if desired). Sorcerers already have Spontaneous Metamagic for all of their metamagic, but Instant Metamagic can give them 2 Quickened spells per day (or two boosted spells like Wizards). Sure, Wizards can now do two Instant Metamagicks per day, but they still have to prepare the vast majority of their metamagic spells ahead of time which means that for most of their metamagic spells, they have to guess (unless they have open spells slots and the time to prep a spell as needed). Sorcerers do not have to guess.
3) A significant advantage Sorcerers have over other casters who prepare spells is Spontaneous Metamagic. This advantage is huge, but was tempered by the fact that Sorcerers are so feat starved. Without this PrC, the Sorcerer could gain at most 8 (9 if Human) metamagic feats by 18th level (assuming he could not take a different PrC that gives him a lot of feats). With this PrC, the Sorcerer can gain 12 (or 13) metamagic feats. This really opens up the door for a Sorcerer. He can use some of his normal feats for things other than metamagic feats and still get an extremely good selection of metamagic feats. Sure, this applies to a Wizard as well, but again, Wizards only gain 2 net feats to a Sorcerers 4 net feats when taking the PrC. And again, Wizards have to guess which spells to prepare with their metamagic. If they either guess wrong on the spell or on the metamagic (e.g. Widened Fireball instead of Empowered Fireball, or Widened Fireball instead of Widened Cone of Cold), they are at a disadvantage. With a good spell selection, Sorcerers are rarely at a disadvantage for not having a good spell to cast.
4) Sorcerers can cast a lot more spells per day than Wizards and with the losing of a Prohibited School, this really is not a good choice for Specialized Wizards. Hence, this means that Sorcerers gain an exponential increase in the number of different types of spells they can cast. Need Widened Fireball? Check. Need Empowered Fireball? Check. Need Silent Fireball? Check.
It's a matter of math. When compared to a Sorcerer with the PrC to one without:
x spells * y metamagic effects versus x spells * (y-4) metamagic effects
And that's if a Sorcerer Incantatrix merely uses one metamagic feat. When using multiple metamagic feats on the same spell and especially using Improved Metamagic, the number of choices increases exponentially.
Wizards are not only limited to what spells they prepared ahead of time with metamagic, but every spell they prepare for one specific metamagic effects is one less higher level spell slot they have for something else they would normally do. So if they guess wrong, they have lost a precious higher level spell slot. Sorcerers have more higher level spell slots to burn (especially at even levels).
Sorcerers are the metamagic kings (shy of Warmages and such). Any PrC that gives them metamagic advantages by definition would have to have a lot of other significant advantages for Wizards to knock them off that pedestal.