The Microspikes don't require stiff or rigid soled boots which means they should fit a range of footwear (indeed many folk use them on trail running shoes). The upper part is a shaped Thermoplastic Elastomer (TPE) harness with reinforced eyelets which is claimed to retain its elasticity down to -30 Celsius.
The Microspikes are quick and easy to fit with a little practice and don't require footwear to be removed in order to put them on and take them off. The technique is to place the forefoot into position then use a raised tab on the rear of the harness to pull the heel into place. I found that I was able to easily fit and remove the Microspikes on-the-go, which is useful when they may not be needed for all of a walking route.
The design of the harness holds the spikes in place nicely and there is no tendency for the footwear to slide out even on quite steep descents. A real positive is that I haven't experienced any pressure points or "cold spots" from pressure as can happen with some crampons. In the image above the Microspikes are being used with a walking shoe on hard ice.
In this image they are being used with a general purpose walking boot in mixed conditions with heavy frost and frozen patches of forest road. Unlike with crampons, it's not necessary to use a "duck waddle" modification to your natural walking style when using the Microspikes, due partly to the much shorter length of the spikes compared to crampons and also because there are no front points which could catch the ground.
The chain and harness hold the Microspikes in place very well, I've not experienced any misalignment when walking across level or rough terrain. Sometimes with articulated crampons strapped tightly to stiff winter boots and secured with toe bail and heel fastener there can be cold spots on the feet from the pressure. I haven't experienced any cold spots with the Microspikes as they aren't holding the foot rigid and any pressure is distributed across the harness.