Shamballa was my very first step to the world of energies. So, even though I have always wanted to try different energies and wanted to go where others may have never gone, Shamballa will always be the number One in my heart. The attunement was given to me "by accident" by a person who I have definitely met in previous life/lives.
I knew she was a friend, not a foe, even though I cannot even remember her name anymore.
I have gotten great results with many other energies as well, but I do go back to Shamballa every now and then. Many say Shamballa is not reiki at all. Whatever. The words do not matter, it is the energies that matter and if they give good results, all is well. Explanations are irrelevant. People seem to love explanations way too much.
Love is all that matters, and all energy healing always comes back to Love.
A few months ago I read this channeling from Archangel Raphael on the subject of reiki and I loved it.
See for yourself: http://www.reikihealingacademy.com/channelings.htm .
It actually made me feel better about my, sometimes seemingly random, adventures in the world of energies. I realized, hell yeah, I can work with many different energies, no matter what all the reiki biggots in the world say!
Follow your heart. I have always followed mine, even though I might sometimes feel lost - especially among spiritual people. They are the worst. They are worst and the best on this weird planet.