I don't believe this implants to mess around with the human dopaminergic system are helpful. Because of several reasons: First there are many Drugs that achieve the same effects in a much simpler and safer way. Second, I doubt the impact of this implants would justify their risks. Third, who will be the volunteering surgeon who implants the iPlant with his volunteering team in his voluntarily sponsored operation room? Fourth, who will donate his health to an internet project...
1. No, there aren't. The goal of iPlant is to make, for example, a person exercise 1-2 hours a day without any problems, and thoroughly enjoy it. There is no drug that does the same to my knowledge. I suppose even taking amphetamine might not sustain this kind of exercise regime for a long time.
2. What do you think will be the 'impact' (do you mean effect?) of iPlants? What do you think are the risks?
3. When iPlant will be medically available, I'm pretty sure that the same surgeons who do other implant surgeries would without any real problems avail themselves for the job.
4. This is a bit silly. Is the Immortality Institute an internet project just because it has a web site? No. iPlant is going to be a viable, medically correct option first for sick people, then for healthy people.