Well, to provide a different opinion, I've never experienced anything lasting from it. I maybe had one realization, once, which is that everything in life is so silly I should just not get upset about it. Though on one of the 6 times I tried it I also had a very bad panic attack. To me, it's just that a drug is a drug, not a panacea.
There is nothing magic about it, and lots of drugs make you think you're smarter than you really are.