I have B&W's, which I used to run bi-wired(LCR)using Audioquest Crystal (I believe that's what it was). I no longer do. I hear no difference. B&W has always been a big proponent of bi-wiring and design most of their line to allow for it. What are the benefits? Here's what they have to say on this subject. To be honest, I don't think I really buy into their theory as to why they believe it is best to bi- wire. Note that they say "keen' listeners should hear a difference. Maybe your hearing is keen enough to discern the difference- who knows. (They also offer their thoughts on bi-amping. Soundhound-- don't read-- they used entirely too much ink talking about those pesky tube amps ).
Personally, I think you should try it. You may find it makes a positive improvement in your system. If you find it does nothing for you, at least you won't have to wonder if you are missing out. (Maybe your friend still has his set around and would let you try them- if they are of suitable length). Bottom line-- only your ears can really answer this question.

You suppose the old "snake oil" salesmen really did go into the hi-fi business?