You run the wire down and immediately start to wrap it tightly around you brake cable. The guy at the bike shop showed us how to do it. You don't really notice them and they don't get in the way. I saw one done like this somewhere in the pictures on this site.

I have one Cateye computer (although not that model) and one Sigma. We like the sigma a lot better than the Cateye. The Cateye is easier to reset than the Sigma.