Laura,
I don't have any first hand information about DBS but I do know a little about surgeries in general and about how many things can and do go wrong. If there are alternatives, I would try them first.

There may be nothing for you that is better than surgery, and I have met several people who have had DBS and even after years with PD they appear to be perfectly "normal". But doctors can be quick to suggest cutting when there remaln other avenues yet untried that can have good results with far fewer risks.

As with everything else knowlege is power. You will know when it is right for you.