I did not have any real complaints about the Furman other than I thought it should have helped protect against the hum. I actually thought something was wrong with my preamp and ended up sending it back to Audio Research. It was only when my dealer loaner (also ARC) did the same thing made me investigate deeper. But it also made me wonder what other things the Furman did not help protect against.
I can not hazard a guess on how the PS Audio would compare. It was a while ago and my system has changed quite a bit. I was happy with it until I upgraded my CD player to one with a lot more tubes. Then it couldn't put out enough power and would kick off.
I would expect a huge difference between the sound of the Furman and the Shunyata Triton. The Triton retailed for $5000. while the Furman Elite 15 PFI lists for around $700. I think a far more fair and interesting comparison would be against the Shunyata Venom conditioner.
But this is only my experiences in my system. I imagine power like everything else is very system dependent. So the conditioner that works best for me may not sound the best in another system.