When I saw these I was surprised that no one had thought of this before.  It seems that tie pins are out of style, or at least difficult to find.  Plus, they poke holes in the tie, and, when lost, can get expensive.  These new ties are great, and inexpensive.  I can wear my tie to the gym, and if I lose the tiedown, no big loss, just get another one out of the package.  Plus, no problems with matching colors etc.  Nifty invention.