Caliban said:
The text explicitly states that Quickened spells are possible with this variant.
In that case, I consider the variant class too potent.
Spontaneous Quicken means two spells per round on probably about a half dozen or more rounds at high and epic levels (if someone took the variant class, they would probably make sure they at least had a +6 Headband of Intellect at high levels).
Other spell casters can rarely do this since they are limited to Prepared Quickened spells. And, other spell casters could not spontaneously change which spell they have Quickened. The Alternate Sorcerer would only be limited by the number of 5th and higher level spell slots and the number per day he could do this for.
This is why Arcane Preparation is not too potent. It takes up a feat (the variant class does not, it gives up the Familiar, big deal) and it still limits Quicken spells to prepared spells (both in number and in which spell is prepared as Quickened).
The high level Sorcerer could save his 6 or so standard action metamagic castings for when he really needs them and he could still cast two spontaneous metamagicked spells in a single round up to 6+ times per day (the full round casting of the second spell is not a big deal).
Additionally, he could take Arcane Preparation and cast even more Metamagicked Quickened spells per day. Granted, a normal Sorcerer (or spell caster) could do this as well, but the Variant Sorcerer has the flexibility to only prepare Metamagicked Quickened spells he knows he will need and then can still spontaneously cast others.
Throw some Incantrix levels into the mix and he has a boatload of metamagic feats to choose from.
The variant class is fine trading the familiar for the move action a limited number of times per day.
But, no class should get Spontaneous Quickened Metamagic casting. IMO. It's game breaking for similar reasons as to why Haste was game breaking in 3E. If someone wants to Spontaneously cast two metamagic spells in a single round, they should get themself a Sorcerer or Favored Soul cohort that the DM can blow up.
