after all the research the vendors have done, and all the havoc people have had with reman'd axles. i would not suggest them to anyone. your average autozone or napa axle that has been rebuilt will not handle the abuse most people do to their cars on the street let alone track passes.
i would suggest used OEM axles in good shape from Ed morad/junkyard or brand new ones. Napa does offer brand new ones with a great warranty.
these seem to hold up well to the power that was put down with my old turbo setup(18psi daily driven). while that is not a standard by any means, the remans would not hold up that kind of HP whats so ever
there is a few companys now offering "built ones". if looking into upgrading your axles make sure whatever company it is uses quality boots and clamps that are better then OEM.