I am a piano tuning lawyer. Let me talk about it. The Pearl River is aimed at the piano teaching and practicing market, with low cost and high market price, which means high profits. Mainly used for government procurement. Xinghai has a relatively high positioning and belongs to central enterprises. The materials used are more practical and the technology is better than that of the Pearl River. Although the price is similar to that of the Pearl River, the high cost directly affects the profit of the musical instrument store. So all the musical instruments are pushing the Pearl River. This is why the Pearl River is so common. If a piano teacher recommends you to buy Xinghai, then this teacher has a good conscience. As for Helen and Changjiang, they are up-and-coming brands. I haven't tried bad reviews.