This is an easy product to review -- these are heads and shoulders above the "durable" binders I've used in the past. Great feel in the hand perfect (smooth quiet sturdy) opening mechanism and good quality durable materials. Only downside is price; these aren't cheap. Definitely worth stocking up on if and when they go on sale.
This binder is definitely worth the extra money (Over a regular binder) because they last so much longer. They can be used over and over again year after year without splitting or cracking. Highly recommended.