Failure or success with Jeg's or Summit branded ( china ) parts

Failure : I purchased a premade braided fuel line from Jegs to use as a return line from the fuel pump to the fuel cell as I had installed a new cell. The fittings leaked, I kept checking to see if they were tight and they were. I went to my local speed and had a new hose made and he told me that although the fittings look legit they are in reality Chinese knock offs. Jegs refunded my money no problem. I did just recently purchase a set of Summit headers , they were cheap at less than $200 , as I am only using them to dyno my motor because I didn't want to put individual a/f bungs in each tube of my new Tubular Automotive headers. I have had Summit shorty headers on my D150 for many years with no problems except having to change a gasket once.