I have had it done on me for physical as well as emotional issues. It was very helpful for me. I have known a few JW practitioners, and they were all considered to be in "good standing", a couple of them even holding postions of responsibility in the congregation.
The science is a controversial one though. Besides being used for medical purposes, it has also been used to test the energy fields inherent in various substances, music, and even to decipher true statements from lies. The science was studied extensively and written about by Dr. John Diamond in the 1970s, and most recently by Dr. David R. Hawkins who has published several books.
I find the science to be very fascinating. But I'm sure that the research done by some of the most recent researchers would be placed on the organization's unwritten "make-wrong" list. Anything that might ever so slightly detract from or disagree with the JW organizational ideology can quickly be labeled "worldly wisdom" or even "the teachings of demons".