I have Shimano MTB shoes which look exactly like the 121's, which I think is what you mean. Last forever- but kind of heavy. Show absolutely no signs of wear in six years, except dirty.
I also have Sidi Rockets, which are very similar. I love them. Soft, (not the soles!) comfy, light. Pretty. I've only had them since this fall, though, but I asked an MTB friend before I bought them, and he said his pair have lasted forever, even with _serious_ mud- like they had to be cracked out of mudballs.
Nanci



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