The only thing I would improve is the color of the binder. It would be better to color the silicone rubber part the same as the plastic portion. Also the mechanism is very good but it can be improved to make it yet more durable. I have several of these binders and one has a weak metal part.
Great binders using these for my college textbooks the extra supper for the spine prevents splitting and the D rings support my book better than the round.