MIT MH-750 cvt bi-wire speaker wire, need advice

I’m currently auditioning the MIT MH-750 cvt bi-wire speaker wire, this is the older version white cable outer insulation the cost of $299.00 used in perfect condition. They sound wonderful on my system. My question is should I spend more money for the new version. I’m using classe’ amp and dali grand diva speakers. I’m looking for someone who has tested the these cables side by side.