Three stars
This floss holder is sturdy.  The cutter is sharp and cuts and holds the floss once cut.  The little knob you wind the floss around is sturdy and does not break off.  The floss is strong and does not break, but is not like the floss i am used to using.  The "U" shaped design is a little deeper than I am used to using, so I have to be careful not to cut my gums.  The supply of floss is as advertised and lasts for several months.
Rating: 3 stars