I have bp ii and did TMS twice in an attempt to go med-free. The first time, it seemed to work amazingly and very fast. However, in retrospect, it actually had made me hypomanic. I was "good" for maybe 3 months and then crashed terribly. I tried it again and it didn't do anything. Well, except drain my bank account. I hear some insurance us starting to cover it, but when I had it 2 years ago, my insurance did not. It cost nearly $12,000 and essentially accomplished nothing.
There have been some TMS threads on the alternative board lately, so you might check there too.
Best,
EJ