Love this towel bar.  Very sleek and looks beautiful in our remodeled bath.  The towel bar is reversible.  I have a very long dual sink vanity and wanted both towel bars to have the open side on the front.  I was able to switch the hardware so that I could have the towel bar on the left and right side of the vanity and both have the opening on the same side.  
At first, we had an issue with the towel bar not staying straight, however, we determined it was an issue with the 'supplied' anchor bolts.  We replaced them with a better quality anchor and they function and look beautiful.  They are sturdy and do NOT move out of place.