I have never used Nick's. But this is my experience by asking simple questions. I asked about complete rebuild of my dress shoes (new soles, heels, cork, and welt etc). I also asked for JR soles.
So the shop has never heard of JR soles. They are the preferred brand for premium men's shoes.
When I asked if they would replace the cork, welt etc.... I was met by silence. They had no clue about what I was asking.
My friend used them for a rebuild. The stitching on the sole was not inside of a groove.
I would not use this place to rebuild men's dress shoes.