I am a professional cellist and after reading your comments on this Topic, would like to give my (musician) opinion on the matter. After using the Hamberger Soundpost (having it fitted in Munich by Mr Hamberger) for over a year, I have to say that it had a major positive effect on my Cello. The sound had a sudden increase in overtones, particularly lower partials, increased projection (about 20% louder and crispier) and produced a quicker response in low dynamics or fast passages. This was immediately confirmed by my colleagues, who also knew my instrument from before. During this year, I have experimented a few times with the tension and position, a thing that I would have never even dreamed of as a musician. I might understand why certain luthiers might be against such an innovation (since it takes from their work), but would also recommend to give it a chance and try it before having a clear opinion.