Originally Posted by
beaterdit
I've used them at various times. Generally handy IMO. They give you extra grip for hiking up steep, soft/loose stuff and protect the sole of the shoe some. They suck on rock. If you want to get some just go to 'sports supply' store and get a 20 pack of football cleats for $5. The bike-brand specific ones are expensive and not real different.
I liked those a lot, hopefully you have better luck than I did with the soles. I think the toe spikes did help protect them. See advice above, think I got them at Big Five. Or hit me up, I've got a handful left I'm not gonna use.