Hi BC,
It does seem logical that a periareolar incision would create a high risk for causing loss of nipple sensation or loss of breastfeeding functionality, but apparently the truth is that such issues are way down there on the scale of risks. I tend to believe that if a surgeon knew that there was a great probability for loss of sensation and loss of functionality with this approach, he would opt for one of the other approaches instead. You know the old mantra, "First, do no harm." So what suzy1qtee says about her own periareolar incision/augmentation does seem to ring a resonating note.
That said, if there is going to be any loss of sensation or tingling, it seems there are nerve branches which pass laterally along the ribs below the armpits which could be at issue. The cause being the pressure of the implant sitting in a less than ideal location. If you search back for recent posts from AspiringG, you'll note that she experienced this with her last surgery. Fortunately she's on the mend, but still, an experience like that can be rather discouraging.
To suzy1qtee: Best of luck with getting the info regarding Danielle's implants and surgeon. If she doesn't object to it (assuming you luck out), please share here, as I'm trying to keep a reasonably current list of who does what and where (geographically), including contact info. (And if I ever become inspired to spend $10/month, I'll set up a wiki to keep public-approved info public.)