Sounds like you feel good about the decision, so I'm glad :-)

I just joined my local Chamber last year and it's been a really valuable learning experience. I particularly enjoy the mixers because their sole function is business networking, everyone knows why you're there, and you aren't committed to spending more than a few minutes with any one contact. As @Anonymous points out, you CAN learn something from everyone - it's just a matter of deciding which format works best for you.

Good luck!