In reply to NobleStone:
I have both Nortec Trail Micro crampons and studded VJ shoes.
In most cases, studded shoes are preferred when it’s just occasional or non-technical icy terrain. It gives a more natural ride and avoids having to stop to put crampons on and off. Absolutely fine to run on paths or roads (just a bit noisy and will be wearing down quicker!). I can wear studded shoes from a car park for miles and miles.
When it comes to steeper neve, crampons give a lot more security. However, crampons are cumbersome and running on sloped slabs isn’t very nice. Same with grassy bits, you would be ripping out grass if it’s not frozen.
I’ve done a fair few Munros in either but would be taking crampons and ice axe for longer outings.
I’ve been quite impressed by Camp running crampons - sturdier design (chains) than Nortec (wire) that holds the top bit and it comes with a proper case that won’t poke through other things in your bag. My missus got them and I’m always tempted to get a pair to compare each - maybe justifiable if I keep thinking about winter Ramsay round…