I don't use it much because I am using another mobile wallet, but the good thing I noticed is that you can add specific network that you want in order to see that coins you have on that network.
It supports many coins specially those coins that are built on top of ethereum blockchain.
You can use this wallet on browser which is kinda convenient rather than picking up your smartphone to use your wallet, but they have mobile apps too.
Metamask doesn't own your keys so you must take care of your keys in order to access your funds privately.