From what I understand of what this is, I don't have much of a problem with it. If a person is dying (as in actually going to die, with pretty much nothing to be done about it) they should be allowed to choose when it happens, and go through as painless an experience as possible.
This allows a person to make the decision, talk with their family and friends about it, and say whatever they feel is necessary, and let them do the same, and pass as painlessly as possible. It's a good thing.