Sure, there will always be some level of pain, even N would come through a needle. On lostallhope they list methods, and give the pain level out of a hundred, and cyanide gets a 51, lower than I thought it would be, but still high. Just as an aside, CO gets an 18, higher than I would have thought.
This forum is under fire by irrational people who think we're a cult. Promoting a painful method, especially one that comes with the baggage that cyanide carries (nazis and peoples temple) is just giving them more ammo. It's hard to see into the future for most of us, given where we are, and why we're here, but some presevation of this place should be in the backs of our heads at all times, if possible.