I was looking for a simple holder to mount under my sink to keep counter clutter to a minimum.  The mechanism and design of this unit is perfect.  The only problem is that I didn't think about how to load the new roll.  You need a wide open end, whether you mount it horizontally or vertically.  I hesitate to mount it on my brand new cabinet doors because I don't want to ruin them.  (Read: don't quite trust husband's carpentry skills)  So I haven't mounted it...yet.