A couple of years ago I switched to ten finger and kept at it for an entire season. I didn't notice much difference, to be honest, although I think I hit more greens in regulation with the overlap, which is why I went back to it and haven't changed. Interlocking feels terrible to me, but I was taught overlap when i was a kid and I guess that's why it feels so much better.
I changed to jumbo grips last year and i love them. Overlap works for me even with the jumbo grips.