I don't like the dentist looking in my mouth, never mind drilling! I'm not there yet, but I really don't believe the day will come that I will ever allow another human being (or robot) near my head with a drill no matter how small the hole or promising the outcome. Where I live, I only know of one case that I would consider successful and she went elsewhere to have it done, and chose her team carefully, all of which cost a few peso's. I think I will be like the old Indian, who, when it was time to leave the planet, went and found a nice sunny rock to lie down on and give up the ghost.
I'm with CS on this one. I'm betting something else will get me first anyway. DBS is like the little girl with the curl: when it's good, it's very very good, but when it's bad....it's awful. But the funny thing is, GDNF also has an invasive delivery system, but based on its history so far, I'd consider that. Now why is that? Must be the marketing company