The product appear to be very good quality, strong and robust, the problem i usually find with these micro connectors is that the connection is broken when sitting a certain way or the connector not staying in the port with the slightest movement.
These connectors sit into my S6 port snug, they do not provide the "click" to hold it firmly in but still sit in snug and stay in with no hassle when wiggling the cable which is good enough for me, time will tell if the connection will be broken when the cables are a certain way but as it stands just now with 1 week of use they are pretty good and worth the price.
with all that being said, the micro USB is a great connector due to the shape and thickness of material having to be used, so companies like this will spend a great deal of time and money trying to produce a solid robust connector which will not bend under pressure plus the 2 little pressure pins to stay strong and provide the all important pull resistance to keep the connector within its housing.