I wholeheartedly recommend NANOspikes!
I have found NANOspikes to be very effective for running on both ice/snow and mud. A couple days ago, I did a trail run where the conditions were more mud than ice. I applied the NANOspikes to my Merrill All Out Peak trail shoes before starting out. I was very impressed with the performance of the NANOspikes. Where other runners (who were probably not even wearing trail shoes) frequently slipped in the mud, I was able to maintain traction throughout. NANOspikes provided me with increased confidence when running under conditions what would otherwise have produced anxiety.
There were no issues with clogging (balling). I did notice that after a while, the NANOspikes shifted slightly on my shoes, but they were never close to becoming detached. I attributed the shifting to the constant direction changes as I was running. That said, I may attach straps to the NANOspikes for my next run. If for no other reason than to prevent loss of the device if it should become detached from the shoe while running.
I have also had the opportunity to test NANOspikes on my Lowa Camino GTX hiking boots while hiking in Harriman Park in New York. Once again, I was very impressed with the NANOspikes’ performance. There was a snow cover of a few inches, with a thin glaze of ice covering powder snow. On much of my hike, the trails were previously broken by other hikers, so I was walking on partially packed powder. The snow was dry, so I did not have a problem with balling. There were a few spots where the snow was wetter, but there was no balling even in those spots.
If you know Harriman Park, you know that there are lots of places where you must step up onto rock slabs, which are not flat, but angled steeply. When these rocks become icy, they are extremely hazardous, and can be impossible to negotiate. Often, the hiker must walk off the trail, into the brush just to avoid these steps on the icy rock.
On a previous hike, wearing an old pair of instep crampons, I found my footing on these icy steps to be precarious at best. On the other hand, with the NANOspikes, I was able to simply step up onto the icy rock as though it weren’t ice covered at all. This gave me confidence, making my hike much more enjoyable.
One note: I always hike with TWO poles, not just one. This can make all the difference when negotiating slippery slopes. While the poles cannot stop a fall once it has started (you need something stronger, like an ice axe to do that), they will help you stabilize yourself to prevent the fall in the first place!
Also note: Before using the NANOspikes (size Large) on my hiking boots (U.S. size 11), I was not sure they would stretch to fit the larger shoe profile. My concerns were allayed when I tested them on the boots before setting out for my hike. The rubber components of the NANOspikes stretches (and recovers) well.
I was very pleased to find they fit my hiking boots, since my only other option (other than an old pair of instep crampons, which aren’t very effective) is my Koflach mountaineering boots with full 12 point crampons. For the conditions I hiked in Harriman, the crampons would have been extreme overkill, and most likely would not have worked as well as the NANOspikes did (the ice was far too thin for crampons to get a good bite).