Peculiar that there are no extensive user reviews (yes I know of moderator TomC's review in Bench forum and few subsequent posts) nor owners thread on the Helor Flux (f/k/a Helor 106). I suspect I know the answer. People are turned off by its heft and price.
BACKGROUND OF REVIEWER/OWNER:
I have been on HB for now a decade. And no reviews posted by me to date. I felt/feel self-conscious that users at my level should mainly be quiet and let the experts talk. Until now, I have read Home-barista 99% of time and posted about 1%. But my palate and skill have greatly improved over the past decade; especially after attending Chicago-Milwaukee home-barista get togethers (GTG) since Fall 2012. That is where w.r.t. coffee and espresso I try to be quiet and absorb another_jim and the other coffee/espresso sages (sages w.r.t. knowledge and experience and not necessarily age). Also I have an oenophile father who offers feedback and loves drinking straight espresso when he and mother visit my home for their grandkids. And I am somewhat a foodie and now since 12/29/2018 an amateur-hour cook.
My palate has not/is still not in the same galaxy as experienced home-barista moderators like another_jim or senior forum members I have met at these Chicago-Milwaukee GTGs. My reviews thus are more global i.e. Siskel & Ebert Two Thumbs Up (with rare enthusiastically up), Split Thumb Up and One Down, or Two Thumbs Down. Those who met and talked in detail with me also know one reason why my palate vocabulary is poor. Good news is my adult son bought his old man a laminated SCA flavor wheel poster for Christmas 2018. I try to look at it with each straight espresso I consume. But hard as Boss refuses it to be hung in kitchen:(
Overall Siskel & Ebert Two Thumbs and both enthusiastically. In fact it would be a Roger Ebert Great Movie (grinder).
* This hand grinder is massive and I LOVE this characteristic.
It is 2185 grams on my Escali food scale. Its grip area diameter is no more than Helor 101 but the overall heft makes it so my teenage daughter does not like holding it. I should say I can palm hold a adult volleyball for long time and my fingers are strong (not Alex Hannold strong) and are somewhat arachnodactyly-like. Also I have (self assessment) stronger hands w/o arthritis (yet). So gripping and cranking the Flux is non-issue for me.
* Built like a tank. Niche Zero vs. Kafetek Monolith Conical: Which is best in the cup?
This thread lead me to the Helor Flux/106. I wanted a titan conical that was easier to use than my Pharos v1.1. I also wanted such grinder to last rest of my natural life (estimated at least another 30 years; my day job and references provide me with this rough estimate).
* Mazzer Robur 71mm conical burr single phase (cost $200 alone on espressoparts).
* effectively zero retention (using Ross Droplet Technique)
* If you love the Helor 101, then you (until proven otherwise) will love this. And yes, I own Helor 101 and use the Helor 101 exclusively for drip with its regular burrs.
* 3:1 gear reduction makes turning the grinder easy peasy (17 grams espresso light medium roast in 35 to 40 seconds with really fast clockwise turning of handle).
* Did I mention this thing is large and heavy?
* If you hate hand grinders, then the Flux will do nothing to change your opinion.
* Cost. If you think Monolith grinders or used Cremina espresso machines are overpriced then you will think this grinder is overpriced. I think at $550 USD (used) this thing is a bargain. I also have no hesitation of buying $750 USD new. I went the used route b.c. new ones have been inavailable new for some time on Helor website. And no I was not going to buy new unless from manufacturer or from authorized seller (post sales customer service). And yes I am aware what country it is made in.
My user experience and photgraphs will be in subsequent posts of this thread. Other Helor Flux/106 owners, please chime in.