Aftermarket axles

I would like to hear from a reader who has some experience with aftermarket upgrade axle kits available for a Jeep Dana 35C rear end, like the stuff from Warn. I prefer not to take on the job of switching to a Dana 44, I just want to feel a little more secure with my Dana 35C. None of the replacement axles I've seen seem to actually provide any figures on how much their product is an improvement over the shear strength of the factory axles and it would seem that's a concern. Are these a scam? Stever