Question for Anyone Who Uses a Cable Weight Machine

You know, a weight stack with cables. This sort of thing, only the version for a real gym.,or.&um=1&ie=UTF-8&cid=10717401693541668829&sa=X&ei=7ntqTaPAG8Oblgfy4ciDAg&ved=0CD8Q8gIwAg#

I’m doing triceps pulldowns on one. Was wondering if there was a better triceps exercise that anyone could suggest. If not, I’ll keep them up, kind of like them.