We have three. One is a hollow-core bathroom door and the other two are multi-pane glass pocket doors. I love having them and wish I had more. Having said that, the bathroom one is a bit stiff and feels tract-house cheap. One of the glass doors runs smoothly, except for a bump in the middle of its run (I have no idea what that is)...the other is smooth as silk, a real joy to use! Sorry, I don't know the brand/supplier; it feels like three different mechanisms, but I suppose it could just be variations in installation(?).
Do these doors need periodic lubrication? If so, how is that done?