Break this class

[mostlyharmful]

OK, here's a base class I made some time ago, something between a caster and a warlock. I would like answers to the following questions;

1) Can the class be more powerful than a straight wizard or sorceror in combat? Assume good spell combos for the wizard or sorceror.
2) How about a cleric or druid?
3) How does the class compare to ToB classes power-wise?
4) Are there any prestige class and/or feat choices that can break the class?

I'd say you've done a good job on tying them down to the action economy at later levels although they still have the squishy SoL cannon thing at lower one's but hey, 1-3 is just a crap shoot anyway.

I'd peg it as somewhere just above ToB since it has Arcane magic but less speed than a Sorc, very playable and with your permission I'll nab it for a road test sometime since actual gameplay is the only real test and it can throw up all kinds of random crap.