Holds my music well and when I am standing holding the binder in my hand the spine stays flexed so my hand is comfortable and I don't have to keep fighting with it to keep it flexed and that frees up my other hand to turn pages! Bought one for my choir director when I saw his old one was bulging. The spine won't split which is a relief!
It is pretty easy to open and close and it is sturdy but if you need to look through the pages you will have a little difficulty. The pages do not slide over the rings as easily as with some other binders.