The value, or otherwise, of bi-wiring certainly does depend on the individual system. Since my main speakers are bi-wireable, I considered that it was relatively inexpensive to buy some extra speaker cable and give it a try. The results have certainly been worthwhile in my system.

Whether the bi-wiring itself actually makes a difference I couldn't really say. Maybe the improvement is simply due to the extra thickness of cable being used. I don't really know.

I expect bi-amping would make a significant difference, but that is obviously a higher cost option.