faster summoning: at 2nd summon spells take 1std+1move action to cast, completing @ end of action (as compared to beginning of following turn).
This is in error. it requires a full round action to cast summon monster but it acts immediatly.
As other people stated, summoning requires
1 round to cast as compared to a "full round action." I specified standard+move simply b/c some of my players forget the difference between casting time:1 round, casting time:1 full action, casting time:1 action.
The familiar benefits are not particularly worth while and the idea of multiple familiars seems a little off. The Improved Banishment is perhaps the only thing that really is very important and depending on where the character is (or where the creature is from) may or may not be of real value.
I find familiars are hideously undervalued and this introduces some relatively minor tweaks to the familiar class feature in the attempt of making it sufficiently appealing that people use it. The 1-mile share spell is one of the biggies; getting buffs and protective spells to work while the familiar is off scouting plus the Celestial/Fiendish features makes them much more able to survive.
All that and loosing out on 2 caster levels. Sorcerers wont get Summon Monster 9 till 20th level. Not worth it I'm afraid.
the Improved Augment Summoning is a waste at +1 per Summoner levels. that means a max of +5 STR/CON... as opposed to +4 with the feat.
I wrote the class for my 3.0 game and wasn't aware it had changed in 3.5. IIRC 3.0 augment summoning was a +1 hp/HD, +1 attack, +1 damage. My class would scale it to +5 hp/HD, +5 attack, +5 damage. This offset the reduction in maximum spell level since you had really beefy Summon 8s vs. regular Summon9s.
In 3.5 I'd change Improved Augment summoning to provide additional bonus to STR/CON equal to half Summoner level (+4-9 STR/CON for a +2-5 attack/damage/hp bonus).