I am using Kimber Bifocal X with WBT CU locking bananas on both ends. Wilson Benesch Loudspeakers include a set of their proprietary jumpers but I elected to bi-wire from the beginning. Simply heaven and I don't believe that I wasted my $$. I don't think that there are any hard-fast rules on this subject. Like everything else it is system dependent based on your perceptions. You may try loaners prior to purchase to experiment both ways. Break-in was greatly facilitated in my system by my preamplifiers ability to include a white noise generator so the whole system spent about 200 hours getting righteous.
Take your time and get it right!
Take your time and get it right!