Are there any shortcomings and limitations of pan-micro OA? Is it useful?

Panwei is the only oa listed company in China, with distinctive features, rich functions, popularization and out-of-the-box use. However, the disadvantages are also obvious: ordinary customer functions can not be customized, the customization price is very expensive, and the source code is not provided. Now there are more and more personalized customization. At present, Tian Ling oa provides another way, which allows users to choose their own functional modules for customization, and the price is close to the people. It can be downloaded for free in official website at present.