The instructions are a nightmare!  There is a bit of math involved in that the wheels rest on a track which is in a bracket which all fit lower down on the door.  Then, there is a splash guard that goes on the floor with almost no explanation.  To add to the confusion, the photo of the splash guard in the listing is not correct.  Our contractor is putting this in while I write this and is really frustrated.  I see that other reviews mention the poor instructions those dont quite capture the confusion.  We held the door in place in order for the installation point to be marked.
Once installed, it is quite lovely and appears to be good quality.  Yes, it is heavy and sturdy.