The binder is sturdy for on-site use. The spine has a 'new' way to add a title label that is easy to work with. The clear pocket window is great. The D rings work smoothly.
I purchased this heavy duty binder and after a month 2 of the 3 rings separated and will not close completely. The $5 binder has lasted me over a year I should have just stuck with those instead of trying to buy a heavy duty binder for [$]. Save your money!