Never heard of it and now that I looked it up, it looks real interesting. The only reiki I've done is on myself.
Be extremely EXTREMELY careful if you are doing reiki. In fact, STOP DOING IT. I've dealt with a few Catholics (and Catholic nuns) who practice reiki, and it's an extremely slippery slope. There's a spiritual battle going on in the world and the enemy will be happy to make use of our hands to take the focus off of God and put it on our own self-empowerment instead...
I'm not casually throwing this out there. I've seen the damage it does to the Catholic faith of its practitioners...