The durability of the Hillsounds is good - about the same as Kahtoolas. Have used (and worn out) a couple of pairs of each brand. The Hillsounds have slightly longer spikes, and more in the heel, than Kahtoolas, which are the reasons I like them better. They also have a strap over the instep, so they rarely fall off/slip (an occasional problem with the Kahtoolas). The model Hillsound also comes in a few flavors - I prefer the one with the stainless steel teeth rather than the chrome-moly plate.
Hillsound also makes a slightly more aggressive version called the Trail Crampon Pro (http://hillsound.com/hillsound-product/trail-crampon-pro/
). The length of the teeth are in between those of the ones above and a standard alpine crampons, like the Grivel G10 or the BD Contact Strap. The advantage of these is that with the shorter teeth you tend to trip less/catch clothing, and they weigh less. While not a replacement for a G10/G12 general alpine crampon, for some locations in the country where winter hiking is popular they're all that's necessary in icy/hardpacked conditions.