When it comes to power conditioning YES, it adds value to the chain AFTER you have your room acoustics dialed in. I would recommend changing the outlet first (about $100), the conditioner you plug your system into next (I use Black Lion Audio PG2, stellar results, about $400), and the actual power cables last.
https://www.blacklionaudio.com/store/power-conditioners/pg-2-power-conditioner/