Xiaomi Market works in a very similar way to the official Uptodown application. From the main window of the application you can take a quick look at the most downloaded apps, and access to their information with just a touch. You can see screenshots of the apps and a description (in Chinese), provided by the developers. In this Xiaomi Market is different to Uptodown, where you can find custom reviews and screenshots (not done by the developers).
One of Xiaomi Market's strengths is that it doesn't only let you download applications, but it also keeps them updated. In this sense it's as good as Google Play or Uptodown.
Xiaomi Market (mi Market) is an interesting and alternative app store, specially for those who speak Chinese.