I've unfortunately not tried POM yet. I had a set of the Banggood caps for a while, but never used them because I heard they were tight and I would be putting them on MX clears, the stems of which are also known for being tight.
There was a GB for some POM caps at one point, but if I remember correctly it didn't get enough interest to meet MOQ.
So to answer your question: I don't know! But the Banggood PBT isn't very high quality.