My rigger built the cables of stainless with nicopress fittings sized the same as the originals. No problems at all. The stainless that Edson uses is supposed to be non-magnetic, but my compass readings didn't change a whit with the new cables.
As far as hints for replacing the cables:
1 Stuff a rag into the pedestal so you don't lose any bits you're bound to drop as you disassemble things (don't ask how I know this one
2 My cables were in cable conduit and I tried unsuccessfully to use a piece of thin line butted to the end of the cable with duct tape. Worked for one, but not the other. I decided to unbolt the pedestal to finish the job. This allowed me to replace the conduit end fittings, run the cables easily thru the conduit, and retrieve the various pieces dropped in the process. Getting to the bolts under the cockpit floor required a skinny kid and a deep socket wrench, but wasn't too big a deal.