I hate flossing.  Whether you wrap it around your fingers or use a flosser tool, its annoying and wasteful. From the foot of floss you cut off, you only use about 3 inches.  I switched to those little disposable ones, but the convenience didn't seem to outway the wastefulness.  So one day I decided to search the net to see if there was a better way.  I kinda had the design in my head (sortof a tape dispenser for floss) so I knew roughly what I was looking for, if it even existed.  Then I found this product.  Genius.
You actually only use a small amount at a time and just keep feeding fresh stuff down the line.  The trick is not to use the floss till its about to break, but rather to feed the next bit through before the floss loses its strength. You don't want it to break and have to re-feed.
I keep one by my desk and pick it up about once a day.  Oh, one last thing.   In my opinion, the floss that comes with it isn't great quality.   I substituted some glide floss I had laying around and it fit fine.  For ~$7 this gadget is a very worthwhile investment.  The amount of time you'll save in the first week will pay for it.  And it seems like it'll last pretty much forever.   For a better sense of the product, watch this video (link).