1. 180-280 are all genuine products, and the price of a little over 200 is relatively normal.
The domestic gear is made by Tengcong Toy Factory.
3. If you like collecting, I suggest buying Mayfit's. If it is just for fun, the domestic gear must be much more cost-effective, the domestic one is hardcover, and the M one is paperback. In fact, there is not much difference between domestic and M. In terms of rotation, it can only be said that domestic products are a little stuck, and M is mainly due to patent fees and international postage. So I still recommend domestic products. After all, it's only twenty or thirty dollars.
LZ recommended a Taobao shop, where I bought all my Rubik's cubes, including imported and domestic gears. The shopkeeper is a master of Rubik's Cube, and all kinds of Rubik's Cube are fast. The key is super good attitude and patience ~ ~