I recently built my first bench. After reading on the arguments over no finish vs. BLO vs. BLO+wax, I decided on a BLO+wax. I've no complaints against the wax, as a finish. It does seem to make cleaning spills off the top easier.
But ever since I added the wax, my Gramercy holdfasts haven't been holding reliably. My guess is that enough of the wax got into the upper parts of the benchdog holes to reduce the friction that the holdfasts rely on. I've sanded the shafts of the holdfasts, and that's helped some. So I sanded a couple of the holes, and with that, things are working fine.
I'm too lazy to sand all the holes, so I expect I'll be sanding holes as the need arises, for some weeks or months.
In any case, it's a problem I've not seen mentioned.