Mistakes CAN happen but the design, materials and QC go a long way in insuring success. Been in engineering to long to accept excuses for a poor product. I've also dealt with the Chinese for over 25 years on a lot of different products. Some are better than others and over time their products by and large have improved. However not all are made the same way etc.

So go with products that demonstrate their integrity more often than not and you'll be better off..