It's funny, I've insufflated 2ce/i on several occasions and it's always the same "DAMN this sucks, not worth it, def will not do again". And then a period of time passes and I kind of forget how much it burns, which leads me to try it again. A vicious cycle!
But it does have its perks once you get over the initial 'hellfire in the nose' feeling. Shorter duration+decreased come-up time can both come in handy in some situations. But most of the time eating is preferable for me.
On the topic of local anesthetics, has anyone tried doing a small bit of cocaine/dimethocaine/ect. before attempting insufflation to ease the pain? I meant to try it for the longest time with some dimeth I had but unfortunately my self control failed me one night whilst rolling, blew through what I had left without a second thought. And dimethocaine on its own really isn't very spectacular, putting me off from buying more.