I first thought it was the technique named after the sheep-shearer with first names Walter Godfrey from New Zealand ;-), now I've read the wiki-article, it's someone with first names Thomas Ambrose from Australia, and belongs in the area of osteopathy and seems to be a pretty gentle form. My experience here is that I had to change my (otherwise very good) osteopath, because I spose the chemistry has to work. Mine now was excellent in the long run for my pains, and relaxes very much, even my sight is clearer afterwards, altho he's only just finished his qualification, but it doesn't help much against the fibro-ache. It helped for him to know that his pressuring needs to be very gentle. He uses a whole load of different techniques, like "Jones", where you find trigger points, but then move the parts to lessen the trigger pain to about a quarter.
Wikipedia, as always critical about alternative medicine, is less friendly about Bowen than about osteopathy in general... citing more evidence of effectiveness in the latter than in the former, but Bowen does seem to be very vague, seeing as Bowen himself didn't write anything down...