I was just in Bora Bora for 10 days back in Feb. There had been a lemon shark attack right when we arrived so the dive companies mostly avoided the big lemon shark dive. We still saw plenty of life, and there is a great chance of seeing mantas. We dove with Topdive, and despite a few minor issues, they took real good care of us.
I have photos from the trip here.
And if you want some commentary here as well.