I've been doing an evil run and been trying out the BG kit. It's pretty fun so far but i'm not sure how it's going to hold up at the end of the series. -4 to hit and -4 AC from the aura really isn't going to to much a fair way into SOA. The poison should be ok, though.
I think it's going to depend on a few things:
1. If they are going to buff up some of his/her abilities in the higher levels.
2. If the kit gets a Unholy Avenger.
Thoughts?