Naim 5i: How important are Naim NACA Cables?

I'm thinking of buying a NAIT 5i integrated amplifier for my Jordan JX92s single driver speakers. I've heard from some that it's essential to use the NACA cables with this amplifier, and that anything else is a marked detriment to the sound. And yet I read a review of the amplifier on Positive Feedback where the reviewer strongly preferred his reference cables.

What is people's experience with trying different cables with the NAIT 5i or other Naim amplifiers? Were the NACA cables a strong advantage?

Thanks, Peter