I bought these from Justin and the crew at Lucky Straps this year (2022)and tested them whist up at the high country in Victoria. All I can say is that they kept my hands as warm as toast without compromising on touch and suppleness.
The fit is true and they will give a little, but only slightly. Overall, another outstanding product at Lucky Straps ! Thanks guys :)
Serendipitously I had just had a wet and cold photography experience in the You Yangs when I came home to find that Lucky Strap was stocking Vallerret photography gloves. A quick pass through some online reviews and I purchased the Markhof v3 in Medium. They basically do what they say they are going to do - the grip on the palm keeps your camera firmly in hand, the flip back finger tips get held in place by magnets and let you get on with using your camera, and everything just works together really nicely in (Melbourne grade) cold weather. I've had them out in just below freezing temperatures, and it was fine, but I wouldn't want to go much lower than that without an additional layer.
For sizing, the chart and guidance provided here on Lucky Strap seems to be on point - I was in the middle of the range for M, and they fit snug and firm though without any dramas getting them on and off. Recommended.
(as an aside, one quick trial in the car shows that I can't wear these while driving - the grip on the palm made smooth steering a chore - so they aren't an all in one solution for all cold weather uses)