I tried it for the first time last night. I didn't break through, but the threshold was very pleasant.
I was extremely nervous and had a hard time calming down even with meditation. I finally just said screw it all and took 3 long draws, holding them for 20 seconds each. Although I didn't break through I did get a very pleasant mushroom like body buzz, and found myself in a surreal kind of dreamy headspace for the next 20 minutes or so.
It was altogether a very pleasant experience, all that nervous apprehension was for nothing. I say try it, I know I will be again.
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