I use Kahtoola microspikes in New Hampshire mountains although one of our SAR teams that I work with strongly suggests the Hillsound equivalent instead.
Until we start getting significant snow, which lately hasn’t started until late December, the Kahtoola exospikes did well on mixed terrain or hard packed snow, thin ice, and rock. Has reduced falls going downhill on rock covered with black ice or slick lichen.
After decades of carrying way too heavy packs recreationally and professionally, my feet have some problems including hammertoes. Â The bindings of the Kahtoolas tend to press down on my Topo boots in ways that are painful to the hammertoes. So I switched recently to BD distance spikes- an advantage not mentioned is that the soft shell top eliminates pressure points by distributing the pressure across the top of the foot. A huge relief for my feet.
In subzero full-on conditions I switch to La Sportiva G2 or G5 boots, both not deformable like the Topos I use in warmer winter weather. Â The G5 accepts the more rugged Kahtoola or Hillsounds (and full crampons when needed) without pressure on my feet. I sometimes use the BD distance spikes on those boots too, when just a little added grip is called for.
One problem with the BD distance spikes- there are some weak points so I’ve had a few break in various places. (The fit has to be near perfect to reduce the chance of that happening.) So I carry an extra pair- they are so light that I can do that easily.