Can you linky some info on the Familiar?
I am going to make a few test runs against this class.
The environment: Cave. Ceiling height is 20' for the bulk of what you see. I will note if there is higher.
Number of encounters in the adventure: 20 creatures.
2 huge CR 7 Pit Vipers (cr3 with 4 levels of fighter trained into them). They are in a room that is 20' high and 30' wide. If they do not die in the first round, they flee deeper into the cave. Relevant stats each:
HP: 6d8+6+3d10+3. Between 18 - 87HP
AC:16 (they have dodge)
Base attack/grapple: +7/+18
Attack: Bite +9 melee 1d6+5 + poison (weap specialization bite)
Space/Reach: 15'/10'
Saves: F/R/W: 10/8/4
Everything else is base per the MM at SRD except all skillpoints went to spot (the purpose of these two are alerting)
http://www.d20srd.org/srd/monsters/snake.htm#viperSnake so their spot is around 9 or 10. They will have a free feat which I would be tempted to set and blind fighting for survival in the caves, but I could throw that to something else.
Ok... Next time, I will put more info down on what comes up, or you can PM with me back and forth and we can iron the test out.