The bars are junk along with most any other bar out of china. If it is a laminated bar, and it comes from china, or says "Australia", but not "Made in Australia", it is very poor quality: the sprocket may not stick far enough out of the nose laminations, the gauge will likely be highly variable down the length of the bar and usually 2 gauges too wide, the laminations or bar rails may be misaligned, and the steel may not be hardened properly, often chipping severely on the rails towards the nose.
Chinese chains usually function well, but may not be the fastest cutting. Archer chains seem to hold an edge for a while having hard steel and thick plating similar to Stihl, but they are slower having too tall of drive links that cause much extra friction with the saw chips.
European made bars are some of the best.