Of course I heard of him. I have even seen him on the street, as his office is near my house. The question is “has he helped anyone”. That no one seems to know.
Everyone seems to say the exact same words about him – “He ‘knows’ things!” – whatever that means. That does not necessarily mean he can give brochos or even good advice. Google also ‘knows’ things.
I also know that he (or maybe his Gabbai etc…) charges quite a hefty fee for his precious time – around $360!! My niece (a single girl) went to him, and could not pay that steep amount. She offered $20 and was given about ten seconds of his time – literally. Then she was thrown out (probably not literally.) Ont the other hand, they may have felt that she was not serious and was actually just wasting his time.
Nevertheless, I try to avoid passing judgement on him without any specific evidence. Maybe the right people are being helped by him.
Personally, I would not waste my time and money though. Rabbi Yisroel Reisman is very vocally against any young ‘Kabbalists’, and SPECIFICALLY Rabbi Kimmel. I suppose He has a bad story or two, but he is not on this forum, so please don’t believe them or repeat them unless they happened to you or your family.