peg,
just planned to be the messenger and not to discuss dbs
dbs is one topic i don't investigate since with my metal allergies i've always assumed i couldn't get one, allergic to silver and gold.
but off the top of my head, i make the following assumptions:
1. dbs can be as effective as current meds.
2. even in moderate pd, i can think of situations where dbs would be very attractive, in jobs where you can't afford to be "off" or you lead a lifestyle where you wouldn't want to be off, a mother with young kids, have to take care of a spouse and don't have easy access to 911 or anyone else - can't wait for sinemet to kick in in an emergency at 2AM, and in all these cases can't tolerate agonists. just thinking off the top of my head. have to assume insurance companies would ask some tough questions before approving.

could be totally off base.