I got a Helix about a week ago. I have followed the instructions and tried out many of the tips and tricks posted here including the breathing exercises. Other then some mild leg trembling (which didn't last very long) i have yet to experience any of the major stuff reported here.
Hopefully I will get to there at some point. In the meantime--and what I really wanted to mention for other new users and those interested in the product-- is that I am quite enjoying the feelings and sensations I am getting from it anyway and so I will continue to use it.
BTW, I have seen a few posts asking about sleeping with the Aneros and going out with it. I've already done both. I didn't experience any type of orgasm and it might contravene the main purpose of the Aneros but I really enjoyed the sensations none the less.
I will keep you posted with any further breakthroughs.