This is my RC of choice just for the convenience, and it's always worked well for me. I also love the sensation of the finger going through the palm when it actually works, it's weird as HELL.

Strangely, last night I had a lucid where I was pretty confident I was dreaming when I went to RC, but I did it anyways, and it DIDN'T work, not at first. Since I KNEW it was a dream, I pushed harder and I plunged half of my arm through my palm, which was really bizarre because it wasn't coming out the other side, just reaching through into some nether space. A nearby DC freaked out when he saw this.