Instruct: Classify Amazon reviews into positive or negative sentiment
Query: They work, but they also NEED some work.

These devices, while well priced and made of good material, need some modification and don't work right out of the box.The shoelaces seem to work well enough for keeping the spikes on your feet, but I've found that the biggest problem is that while climbing the spikes would roll underneath my feet and I'd slip.I had to make some pretty heavy modifications to these things to make them work for me. One being a superior set of nylon straps to replace the shoelaces. And the second being welding a piece of metal to the part of the spikes that touches the bottom of the foot.I say two stars because they worked, but only with heavy modification. If for some reason I needed to buy a second pair, I would buy a pair like these. But be warned that you need to do a little work before these things can actually be useful.