I purchased the Helix a couple of weeks ago and I had an opportunity to try it out. Like many people in the forum, I did not get the magical response that I was hoping for. Here is what I did.
1. Clean with a water enema
2. Injected 5cc's of lubricant in the rectum.
3. Inserted the lubricated Helix.
After the initial feeling, I felt quite comfortable. After a few minutes, I really didn't get much sensation at all. I put on some relaxing music and rolled on my side. Did the flexing of the PC muscles for 15 min or so. I tried many of the positions that I read about on some of the other blogs and still very little stimulation. I sat up "Indian style" and started to rock back and forth. I started to get a nice feeling, but I was afraid that I was applying too much pressure on the perineum by sitting on the device. I had much more internal sensations than from the external part of the device.
I guess that my biggest problem is that I have a hard time becoming or staying aroused. My penis is completely flaccid and I don't feel like there is blood rushing down there. In fact it feels like the opposite, like the device is hindering the blood flow.