As an older guy who has beaten up his hands for thirty six years working on machinery outdoors, I have very poor circulation in my hands, plus some finger tips that have been frostbitten in the past. I mostly rely on wind stopper type liners under heavy mittens anymore, shedding a mitt for a few seconds while making an adjustment or starting a bolt, then returning the hand to the mitt to warm it back up.
A lot of times, though, I need dexterity for long periods of time, so have been looking for years for a truly warm glove.
While the Guide is not the end all answer to all my dreams, it comes closer than any other glove I have found. Changing a tire in +5* F in SW Wyoming (with a 25-30mph wind adding additional chill) two weeks ago, the gloves did pretty well for the 30 some minutes I was working. A few cold spots developed where touching the frozen metal tools, but no stinging or numbness occured.
And bar-hopping around downtown Anchorage last week in -20* F on foot was nearly a pleasure, my hands stayed toasty warm for the 10-20 minute walks between pubs, while my buddies were very happy to get back inside to warm up.
I ordered this pair to fit somewhat snugly; my next pair, and there will likely be a next pair, I will order size large for a looser fit.
I am going up on the North Slope for work this winter, and will write another review in the spring to let you know how they hold up.
Good gloves, if a bit spendy.

The shade change is very fast, and is working well on snow to shade and back, very easy on my old eyes. Light transmittal seems about perfect. Optical clarity is excellent, with no distortion.
These glasses are very resistant to fogging, and under some pretty extreme temperature changes; best I have experienced.
They are also light and comfortable to wear.
I like the larger size of these glasses, the side protection is very good and blocks excess light even on open snow(these are ANSI approved for all you working folk).