For what its worth...
My Uro recommened non-nerve-sparing open RP due to a really high pre-surg-PSA (see below).... I took his advice and am glad I did. My pathology showed cancer all the way to the edges of the specimen...AND a positive margin at the bladder neck. I feel if I had nerve-sparing, I would have had multiple positive margins...as it stood, I had a PSA rise (again see below), and had RT and HT. CLEAN PSAs ever since (praise God!).... AND... with Cialis, usable erections (not what I was, but close enough for rock and roll, as we say!)
Admittedly, I'm kind of a freak of nature in that respect, but just remember----Never say NEVER AGAIN!
Good Luck!