Pupswoof117 if you get issues with it, it's best to try with SSH. If something gets hung up with extension manager, it stays hung until the issue clears out.
For instance, if it can't find an extension due to it being abandoned or an issue like this one, I've seen it hold in memory and continuously retry the install on it over and over again and report a failure. Even if you moved on and tried to install something else.
It's super convenient to use, especially on shared hosting, but it's limitation is with how composer behaves. Just a heads up.