They're fairly well made, and somewhat robust, they've not as robust as the old style Neutrik ones with the larger bodies, but they tended to put a lot of weight on the socket, so these may well be the best option overall.
Not had any fail yet, but they do start to feel 'well used' quite quickly. Overall they're fine, but I suspect I'll be replacing them every couple of years.
All of that being said, I'm not aware of any better options on the market (at least, not without going for some of the oversized plug options)