Many nice gents in this site, highly reputable common folks audiophiles like @lalitk @wig and others have mentioned these, so it’s probably time to create a specific thread on Zavfino, a direct sales cables company based in Canada with presence ‘ distributors in US, also direct:

I took the advice of these folks with a power cord, the Prima MK2

I could not be happier with this cord, something that would easily cost $2,000 or even $3,000 from other better known cable makers. It’s outstanding, for about $500. Absolutely amazing build, and packaging too. It sounds great, very quiet. I am sure the cheaper PC, the Majestic at $390 is very good too: 
I now have the Prima speaker cables on my way. Call me “sold”.

No BS, truly top quality cables company that flies under the radar. Very affordable too. Take a look. No relation to the company, just a happy first time customer, thanks to my Audiogon friends here
So, I installed the used Dart into a Audioquest Niagara 1200 that powers my 2 front JL F-113 subs.
The power cord that I was using was a DIY version that I made using 10ga .9999 solid silver wire terminated with Furutech NCF fittings.I must say, the Dart seems anemic compared to my DIY cord. That is, the bass is barely detectable.

What  10ga .9999 solid silver wire do you use ?

The 10 gauge silver wire that I used came from a supplier that provided documentation showing its .9999 certification.
I then polished it, applied some Furutech Nano liquid, pushed the conductors through the best oversized teflon tubing I could find, installed Graphene mesh sleeving, slightly twisted the 3 conductors then installed Furutech NCF fittings on the ends.
The parts alone cost over $2000. It is an awesome looking and sounding power cable. If purchased from a company it would probably be in the upper $$$ range. Its best attribute is in the bass performance.

@ozzy, did you solder/crimp spades to the conductors to insert into the AC plugs? If so, which spades did you use? Thanks. 
@thyname Could you provide your experience with silver dart vs prima? I finally got the fusion XLR and 1st impression is very very promising, both finishing and sound quality.

That makes me wondering what are the additional impacts silver dart can provide? 

I touched upon this briefly on my previous (long-ish) post above, but a to expand a bit further:

The only cables I was able to compare (and own) direct between Prima MKII and Silver Darts are power cords and speaker cables. Interconnects --- I only own the Silver Darts which I bought from the start.

Silver Darts are NOT a huge improvement over Prima MKII, and Prima is definitely better value for the money. Of course, this is only valid for me, my equipment, my ears, my room. Other people with more elaborate systems and better trained ears may think otherwise.

If someone forces me to "quantify", Silver Darts are perhaps 5-10% better than Prima MKII. Same overall tonality and timbre, but maybe a bit more coherent / focused, and a bit more "airy".

My advise, if someone is looking at Zavfino: if in budget - you are better off doing a full loom of "lesser" tiers (i.e. Prima, majestic, Fusion, etc.), than buying one or two silver darts.

Hope this helps. Take it with a grain of salt. One man’s experiences & opinion.