I had a soundsmith boheme cartridge with the ruby cantilever. I liked it a lot. My soundsmith sussuro has an aluminum cantilever. I have no experience with the boron cantilever but, I can say the ruby cantilever survived quite a few accidental drops onto the record. It was tougher to break than I thought it would be. I always worried about snaping it. The ruby cantilever just looks cool too.
Andy
Andy