"I do think that the Oregon model is well-regarded," said Steve Hopcraft, a spokesman for Compassion & Choices. "Every single independent study says it's working well and none of the slippery slope arguments about killing the poor and the disabled. It really hasn't happened."
But Rita Marker, one of Montana's attorneys and the executive director of the International Task Force on Euthanasia and Assisted Suicide, said the Oregon law is a "terrible model."
"When one transforms the crime of assisted suicide to medical treatment, it changes everything," she told ABCNews.com. "It's one more treatment available to the patient at the end of life, as good as chemotherapy or hospice."
Clay Baxter, whose father is immortalized in this Supreme Court decision, argues that his father's slow, painful death is a reminder of the need for giving the dying more choice from their physicians.
"Personally, I don't think I could do it," said the 52-year-old who works in information technology at a North Dakota hospital. "But I haven't walked a mile in his shoes and lived year after year with this. How much can you take?"
His sister, Roberta King, said she agrees.
"The lawsuit was one of the things my father was passionate about in the end," she said. "He wanted to stay alive to get it done."
"I got involved because I knew how much it meant to my dad," King said.
"Everybody should have the option," she said. "I wished my father had had the option -- the comfort of being able to have some control. That was what bothered him the most."