I have on all 3 pairs of mine - 2 studs at the front for extra grip in the mudI have 3 pairs of SPD shoes - none of them have studs.
It's hard for them tot he difficult thing with saying they wore out after"a single ride" is that who know how far they were walked in? I rarely get off the bike when I am out and it's a very short distance when commuting, so I could ride all year and walk less in my overshoes than the OP who said that they only made a few stops. It's imposdible to quantify. Wiggle also don't know if it's actually only one ride, I guess too. I am not suggesting it wasn't, but thinking from their point of view.