This plug is affordable, it does seem sturdy, too.
However the plug's diameter is slightly too small, which makes it sit bad in some headphone outs.
The strain relief is more of a pseudo relief, it is a simple hard plastic tube, that sits within the plug's body, covering your solder joints. Will not do anything of value, when somebody really pulls the plug with the cable. So using additional shrink wrap here is recommended. This plug maybe co-branded "Neutrik", however doesn't compare.
At the relatively cheap price tag it is still more sturdy, than the penny items coming from cheap labor places.