I now have several of the Main Stream devices. I have found that adding them to the main outlet and the first position of my power conditioner makes a significant improvement in the flow of the music, the noise floor and resolution. Colleagues of mine also use the Swiss fuse box and Snub Nose with excellent results. In this world of diminishing returns for high priced audio gear, it’s nice to see a company offering great products at a fair price.

I have been building various systems over 40 years and can state these AC Filters are extraordinary in performance and dare I say an absolute bargain!
Price to performance value is completely off the charts! Tremendous customer service all the way through, thank you Mark!

I received a generous offer from mark which included extra graphene sluggos, what a great human , I’ve had them in for almost two weeks now , thin sounding, but spacious and full of clarity, not edgy sounding but lacking body, but, there was an underlying bass line that needed further investigation, as I said after the 2 week period, these things filled out and is now producing glorious sound, hype is one thing, but experience is another and boy do these things deliver, it enhances the sound to a degree that no fuse could, in conjunction with the Swiss digital fuse box , the sound is expansive , expressive with clarity, power , prat and a solid bass I didn’t know my amplifier could produce, I knew it was there , but it was only hinted at , yes they do work, my system sounds effortless and at high volume, it just continues to soar , no drawbacks, unless your speakers can’t take it . I am truly amazed by the sdfb it does what it says on the tin , I have 2 and a third on the way, outstanding product, I recommend it without hesitation. Long live Vera-fi !

Great bargain

The Graphene Sluggo delivers exceptional performance in several key aspects. Most notably, it exhibits outstanding micro-dynamics and resolution with minimal coloration. The separation between instruments and musical notes is remarkably precise, creating a clearly defined soundstage with excellent layering and imaging.
The device excels in both initial transient response and decay characteristics, with leading edges showing impressive clarity and trailing notes dispersing naturally into space. Background silence is notably enhanced, contributing to improved instrument positioning and overall immersion. The wide soundstage maintains clarity even with complex electronic music or heavily produced tracks, preserving the richness of accompanying instruments without confusion.

Main Stream works very good together with SnubWay I like these pair.

An example: Listening to Jimmy Smith, "Back at the Chicken Shack" album.
192/24.
With the Main Stream plugged into the house line that powers my network gear, it sort of sounds like I'm front row at a club. I'm hearing the amps and Leslie speaker from close range.
Pull the Main Stream out, and it's like I've moved back 5 rows. Everything still sounds good, but not as distinct as front row.

The Piggy Extreme with a SDFB and Graphene Sluggo made my Musical Fidelity Nu Vista 600 amplifier sound like never before. Bass a bit deeper and more controlled, soundstage deeper, a little bit better stereo image and placing of instruments, more natural sound overall. In short, a noticeable extra improvement of SQ and well worth it. Have a SDFB for my Holo Audio Spring 3 KTE dac as well, and also that again improved the SQ.

I really like both the Snub Way and Main Stream. Significant noise reduction with no loss of detail at all. I like using them so much with my stereo that I bought a second set to for my home theater with excellent results. These are much more effective than the puron, which I moved over to my subwoofer with good effect. Well worth the money at my home!

I am using these with three way 4 ohm sealed speakers. They are very simple to connect and haven't dropped the signal once. Bass is tight and they play loud enough. The sound stage and instrument separation opened up noticeably after many hours of use. Well worth the price!

A truly amazing product, better than any fuse , I am now enjoying the best stereo imaging I’ve ever had, the depth it creates is truly amazing, with width , clarity ,drive and no compromises with the graphene Sluggo , a truly jaw dropping experience , thank you Mark !

I think it is one of the best plug in products on the market.

At this price point I wasn't expecting much an willing to take a chance. But I am pleased to say that the improvements are noticeable.

I bought 3 of them, 2 for my desktop system and 1 for my surround system, all plugged into the first outlets of power conditioners. They provided clearly audible improvements in sound quality and enhanced my enjoyment of the music, more nuances, better dynamics, bigger soundstage.....For the money, they are an excellent value for upgrading highly resolving systems.

Started with a SAFB on a PP Audio P5. It seemed logical that the fuse was a bottle neck for power flow. It another high-end system, the manufacturer uses breakers, not fuses. I heard an immediate improvement. I now own eight of them, removing one SR Master fuse and other SR fuses.

I installed graphene slugos in the PS Audio DAC mk. 2 and the BAT VK-80. Through dedicated 20 amp line, I am driving 1000 watts per channel into PS Audio FR-20 speakers. SAFBs made a profound impact. This is an end game system now. Said it before but this time it is a commitment. Last dollars spent.