Not personally, but I know for a certainty that an elder and his wife in my last congregation acquired a nice bungalow from the local council because they'd been praying to Jehovah to get it! Clearly, divine intervention.
There's also the case of a building contractor who promised God that he'd study with JW's if Jehovah would help him find a leak in the roof of a new building he was responsible for. He then found it after praying. Miracle of miracles!
I rest my case.