Replacing The Factory Jumpers On Magnepans - Does It Improve The Sound?

I have 1.7i Maggies and would like to try some tweaks if it really improves the sound.  I've read some conflicting opinions on replacing the factory steel jumpers with high end jumpers from some of the well known cable companies, like Cardas, Kimber, etc.  Some people hear an improvement, while others say they can't hear a difference.  If you've upgraded yours, please share your opinion.