Is high end Power Conditioners worth the extra $$$

I am already using an audience AR6 which has given me good improvements together with a dedicated power line (with Oyaide wall outlet). I am still separating my power amps (Rowland 500) to a separate distributor to the wall.

There seems quite a number of higher end power conditioners like the AR6T, Synergistic Research 10SE, Hydra V-Ray V2, etc that are on the market. I would like to poll people who have had experience already with power conditioners and have upgraded to these units and would like to know what it brings.