The main problem with 1Mobile Market is that it has dozens and dozens of fake, fraudulent, or outright malicious apps, so you should keep your radar up when picking what you want to download. You can, for example, get the Snaptube app there, or one of a ton of fake apps that use its name.
Another problematic element of 1Mobile Market is that it requests an excessive number of permissions. And to top it all off, your device has to be rooted, otherwise you won't be able to automatically install the apps once you've downloaded them.
1Mobile Market Lite is an alternative to Google Play, Aptoide, or Uptodown that has a few pros but more than a few cons.
- Android 4.0 or greater is required