I posted a review in the Member Reviews section:

https://forum.audiogon.com/discussions/furutech-ncf-clear-line-what-to-expect

Try the Puron filters. Way more bang for your buck.

ozzy

I use 2 myself and love what they do. 

Thanks for all the responses thus far...

@gnoworyta - if I were you, I’d spend the money on a Puron. You will hear a major improvement in SQ. There is a post Puron thread here. I recommend reading it. 

I have one. It’s sitting over there on the shelf. I could not detect any changes in my system while using it so I removed it. Sell it to you for cheap if you want to try it for yourself.....

I have one and plan on another, it's possibly one of the easiest things to try out for yourself.

I too could not detect any improvements using the item. I think they are relying on the NCF material to provide most of the benefits.

ozzy

Many users love it say it makes everything clear with better detail.

Interesting. They were listed as a 2023 Editors Choice component by The Absolute Sound. I was considering a purchase, but may just stay away. Thanks for the feedback.

I had four of them and sold them all.  They did not appear to do anything either on audio or video.

See: 

In my system I couldn’t detect any improvement or detraction to SQ with the Clear Line . I’ve experienced positive SQ improvements from Puron and Shunyata Venom Defender either being used separately or in combination