My first and the last experience with bi-wired cables was the following: I simply used the same cables in the single-wired setup in different positions: lower binding posts -> jumpers to upper binding posts and the same with upper binding posts and then trivial bi-wired connection. The first result brought me forwarded bottom and lower-midrange. The second result brougt me forwarded top-end with upper-mids which is certainly much brigher than the previous. The third result was balanced but everything was too airy with no presentation. Finally I've sold biwired and staying with bare wires threaded through the holes of the WBT binding posts of my speakers with no jumpers -- simply the best connection that I could think of.
Extra pairs of binding posts on your speakers can give you an advantage of biamping them rather than biwiring. There are some ideas to use for bottom end one pair of single-wired cables and for top-end another pair with best-on-your-ear matched brands -- at least that makes more sence to me than just blindly buying bi-wire cables IMHO.