China glass is often argued to be inferior because of the glass not being thick compared to heady pieces which are made with more love, and attention to detail. China glass is  mass-produced with the aim at making the most money, and this can cause some issues. Many of the times they are cheaply made with not too much thickness to the glass for the pieces from China. Sometimes cheap bongs may look beautiful, but have their own fair share of problems when actually using. They can clog really fast with resin if the airholes are not too big.