They have never given me problems, and he seems to take the same direction.
That said, it is not super strong materials. I would say that daily use for recharging batteries or 5-8 hours after the batteries and power, allows a life expectancy of this type of product a little over two years.
But they are cheap, and in any case within two years we will have changed mobile, so it will not be the same batteries, and it will get another charger.
For users who like me have smartphones that open, allowing to have several spare batteries on oneself always available, it is an essential accessory. For owners of iPhones or phones Nexus, you can not open, of course there is no interest in buying it.
Asian manufacturers could bring to market more robust and longer lasting chargers, but given the constant evolution of materials, this does not present useful in my opinion.