Dual plane, sandwiched in between layers of muscle.

That's one I'm not an authority on. I was under the muscle, and I know a number of gals who've gone over the muscle, but only one or two who went dual plane--and their recovery stories were very different. I don't think I'm the right gal to answer this question.

I've talked to a few girls who got big implants from my surgeon, and inspected his work with my hands (and mouth). I think I'm in pretty good hands.