What is the quality of B+W, Baogu and MGO filters?

B+W and Baogu are both good, but the price is a little expensive. Ordinary photography is not necessarily willing to spend too expensive filters. I have used MECO filter, which is quite cost-effective. I bought a UV mirror first, and the coating and transmittance are good. Then I bought a ND, and the experience was good. It can be seen that great efforts have been made in both process and technology, and the effect is satisfactory, with high quality and high cost performance.