I've tried it and I love it. But I don't believe it really works by unblocking energy meridians -- that's just a creative use of placebo effect. Read the
Wikipedia entry.
Apparently tapping on a doll gave the same benefit, as did tapping "sham" points on the body. I think it really works by giving you something to do while focusing on letting go of harmful emotions. It might also easily act as a healing "state trigger" (like in the story of pavlov's dogs).
But the point is it really works. Combine it with
brainwave entrainment and you're set.