It seems like an alright method, I feel like it used to be easier to get until DMC went down. I haven't been able to find any since. I do think a gun is a preferable method but SN is good because the chance of irreversible side effects is less of a risk. With a gun, you do it wrong and you could be a vegetable. If you're saved early while hanging, same outcome, or brain damage at the least. Falling is extremely risky and if you don't go high enough or survive some other way, you will be incredibly injured. As far as I know, SN doesn't have the same risks associated with it, so despite the downsides, it's rather popular. Plus in some countries, it's cheap, easy to get, and a private meeting