I have the Kuiu Superdown PRO glassing glomitt. A good idea, but the design lacks competence. (I was gifted a pair, not something I'd buy)
It is not a good design for working in cold weather. I don't use them outside the shooting range. A liability if you bring these into the backcountry believing your hands are protected.
The wrist lanyard. They got that one right. Working in cold weather means you'll take off your mittens a lot for short periods and you really want them secured to your body.

Normally you'd wear a leather palmed work glove for dexterity and reinforce this with a wrist-warmer. The Kuiu are too tight, so you need to go one size up for this to be possible

You don't split the mittens and isolate one or two fingers. That negates the purpose of a mitten: Retain heat and give you the option to ball the fingers into the hand and force blood circulation/heat.
Also, the cuff needs to be 1-2" longer in order to retain heat. Current design slides down and leak. The elastics are fine, but the sleeve is not.
This detail is is somewhat revealing and limits the mitten to quite warm weather. You don't puncture your raingear; this has the same effect in cold.
When you shoot you pull off the mitt with your teeth and drop is as it is secured by the lanyard... I'm not sure what happened here: It is a terrible design and if you INSIST on including this feature, don't do it.
I'm not sure if it's just my mittens or a the seams/manufacturing process/design flaw, but these side panels have less loft and are cold.

Lightweight? Not really, my Black Diamond shell mittens with Devold Nansen liners tick in at 220 and are superior for both heat and weather...

Almost every pair of mittens I own are better than the Kuiu, regardless of autumn or winter.
