In reply to DR:
Ive used yaktrax pro which dont have the spikes or studs, just rubber and chain coils but with the strap over the forefoot to keep it in place, thats worked great on anything thats not too steep.
I have in my possession a pair of chinese version of the microspikes, probably not as well made but to the same design, yet to try them but they feel as solid as my friends microspikes if a tad heavier (not bad for 1/4 the price tho)
Reason I didnt go for the yak trax run version is that Id get annoyed with the studs on hard ground whereas the standard version is fine for running on rocks and road without significant wear.
Post edited at 22:02