This topic was one of the big ones for me. I stumbled across it accidentally, not from an "apostate", but from a college course on tape about the history of Egypt (I recorded my journey out of the WTS here, if you're interested). There are over ten thousand pieces of archaeological evidence for the 587-586 date, and zero that support 607. Ten thousand on one side, zero on the other. It is not a disputed date by anyone but the delusional Governing Body.
Of note is that originally the supposed starting date used by Russell was 606 B.C.E., not 607. In fact he died still believing it was 606. It was ony after it was pointed out that Russell was so inept as a researcher that he didn't realize there was no zero year between 1 B.C.E. and 1 A.D. that Rutherford suddenly "discovered" that the Babylonian captivity actually started in 607, so the numbers still added up to 1914. In my opinion, 1914 is the smoking gun.