I bought a few sets of these when they were on sale around black Friday but they are easily worth the few extra bucks at regular price, and significantly better priced than some of the "fancier" models you can get from fitness catalogs that are 2-3x the price. These are made of chunky plastic with rubber to grip the bar, and I was concerned about how well they'd hold up in my gym that is populated by young athletes who don't always treat equipment with the care they would treat their xbox. However after about 6 weeks of daily abuse, they are still holding up well and have shown no signs of wear. Even if they were to break, I wouldn't feel bad about grabbing another set at this great price.
If you're looking for a better option than the cheap spring collars, buying a set of these would be an easy no-brainer.