Hi [@mention:74919956581841384]

Ive got a few of these around the house. I don’t use them for the hifi, but have them for the TVs, Blu-ray, computer, chargers etc. If they do anything for the TVs it’s only subtle. But I like the fact they filter the smps from the house mains and vice versa 

I've got a couple in my "computer room" (actually the third bedroom, but I've re-purposed it) - They've got the computer (obviously), a printer,  USB hubs, NAS, switch and router plugged into them. As Finkfan says, they are good for all those switch mode power supplies and keeping their rubbish away from the rest of the house wiring.

Now for the audiophile/nutter bit - the fans in my PC run quieter when the PC is plugged into one of these. No I don't know why, and I can't think why they should, but they do. I kid you not

I also believe the SQ of my system improved when I plugged the NAS/switch/router onto one  - I didn't expect any difference, but I got a bit more clarity to the sound - nothing earth shattering but noticable and positive. I wasn't expecting or listening for differences, but did hear one so it's probably not "buyer's bias".

I did have one of them on my old (non Naim) hi-fi - can't say it made a difference.

So they work for me, just not in the use they're intended for.