The reviews on FT are mostly favorable, too... 3.5+ and up...
I'm not advocating for this device, but I do feel it got a baddish rap. I find it interesting that most negative reviews come from English writers, and although I cannot read them (and I'm too lazy this morning to run them through translate), the Russian reviewers seem to love 'em.
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In fairness, my assessment was based on my own personal experiences, which were significantly different from yours (acknowledged). Everyone I know had similar experiences, except for you (which I'm in no way doubting here). Ours all were constantly bopping over to New Coil/Same Coil, and the vape was discernibly choppy next to the authi.
You probably wouldn't know this but I was very hopeful for it to be adequate, because I was a little upset with "Authi & Company" at the time. I was very disappointed when it didn't go the way I had hoped for. Now if I had received the one that YOU got, I'd likely be singing a very different tune these days, on numerous fronts.
Instead, I've embraced the authi for its good points, and left my bad-taste experiences with Company behind.
Adjustments are often necessary with any plan.
I'm thrilled to know at least one US based person who has a "good-experience" unit.
All these quotes! I'm morphing into Unc.