It depends on how revealing your system is and whether you're simply jumping biwire speaker binding posts. But for sure, if it has stamped crap metal jumpers you should hear a big improvement
I have Emerald Physics 3.4s with outboard XOs. They include some of the cheapest jumpers, which really detracts from the 3.4s hidden potential. The included jumpers are also short, which means people are leaving the XOs on the speaker bases, which vibrate like crazy. I replaced them with high quality 2ft jumpers so I could get the XOs off the bases. The improvement for a couple hundred dollars is/was... jaw dropping. These speakers deserve better