A simple surge protector just tries to stop spikes that could damage equipment. A line conditioner generally tries to also address issues with the AC sine wave - essentially "cleaning up" the power being provided to your equipment. How much improvement can be had from that conditioning depends on the electrical service in your area.

I'd be leery of spending $100 on a power cable unless you can return it if you don't hear a benefit. The electricity has traveled across dozens (probably hundreds) of miles of various copper and aluminum conductors, so the practical benefits of tinkering with the last half-dozen feet are rather heavily debated.