I'll second, the walmart suggestion. Cheap way to find out if you like them.
Personally I didn't use them until I blew my knee out on a trail. Fashioned a pole from a sapling, and was surprised at how much pressure was taken off my knee. Made it possible to finish the trip, even if I was in pain. Otherwise I may have had to crawl to the nearest TH.
Since then, I picked up a pair at Walmart, and love them! I also noticed they help me hike faster once I get into a rhythm. I'd like to pick up a pair of CF ones, but at the moment, I haven't felt the weight of the ones I have, particularly burden me.