I did have some problems with hairs showing up, despite the promises made by Dr. B's clinic. Not that they have caused any problems or infection, as best I know.
They started showing up during dilation and about a year or so after my GRS. They are very small, and look pretty foreign to the area.
I believe this is kind of a hit or miss proposition. For me, if I had to do it over, I may have had the electrolysis prior to the GRS. This however, would have been an extra investment of time, money and discomfort. Whether you do this trade off will be up to you.