They were the first available and affordable a couple of years ago. They are fragile and feel lighter, and can't stand too many flat hits, the spin is decent and the rebound is similar to the celluloid kind, but slower. Use them if you have a tight budget and you are not too picky, but for serious tournament performance try to find something else.
I am an amateur player. I bought the balls online, and the first ball I used was very soft to the level that it could not be played. The seller provided me evidence that the balls are original, but apparently it is not uncommon that DHS balls are defectible. The other ball I used was better, but still very slow compared to other 40+ balls like Nittaku and Tibhar that my friends have.
It is quite different than old material. The quality is also not consistent on one ball and on different balls. One example, if you use thumb to press on the ball surface, some areas are really soft (like those 1 star cheap brand balls), some areas are medium hard (the hardness and consistency of the hardness definitely are not compariable to the YinHe and XuShaoFa). I just couldn't believe this ball is used in many international tournament Does DHS have different quality 3 star balls like its Hurricane rubbers which have national team version, provincial versions and the retail version.
Too heavy a ball for me. I've also played Yinhe and Nitakku Premium poly balls. Both are better while Nitakku is very good. I had no difficulty playing with it because its characteristics are so similar to a celluloid ball so that I couldn't even see any difference in its bounce and flight trajectory.