Anyone not giving this product a 5 star review probably hasn't repaired many -- if any -- hoses lately.  The connectors provided at the big box stores are supposedly good to repair both 5/8" and 3/4" hoses.  Anyone who has bought these plastic and/or brass coated connectors know that they are too tight for the 5/6" hose and too loose for the 3/4" hose.  These are brass and are the right size to make a proper repair.