What is your opinion on String Theory?

For once, I disagree with Richard Feynman, though I have to say a great deal of work has been done since he made the remark. In fact his sum-over-histories work and his well known Feynman diagrams are a fundamental part of not only string theory, but also it's development M Theory. M Theory appears when you change the 10 dimensions of string theory to 11, and seems to combine the 5 versions of string theory into the one M Theory. My own current research is in this field, and while results are a long way off, the maths fit absolutely beautifully, which is almost always a sign that the equations are at least, on the right track. Mine is not the only team in the world working on this, and maybe one of the others will hit the jackpot first. If so, we will all learn from it and it will be another step towards our understanding of the Universe. It should also be born in mind that at the time Einstein published the Theory of Relativity, many contemporary physicists and mathematicians considered it nonsense, and even the Great Man himself said much the same about quantum mechanics. To sum up, I would say that the variant of string theory, M or 'Brane Theory is pushing us along the right path, or at least, in the right direction.