Mammoth Networks' VPS subscriptions default to an unmanaged service, which means that:
Our aim is to provide a fully automated system such that you should never need help from support: everything that we as the service provider is responsible for should be available to customers through our control panel, mPanel.
Compared to a fully managed service, the primary advantage of an unmanaged service is cost: an unmanaged service is typically significantly cheaper than managed.
Depending on your level (or your employees' level) of technical knowledge, the disadvantage is that you are entirely responsible for the configuration and ongoing management of your VPS.
While there is much written information available (both within our Knowledge Base and many, many other websites) the learning curve can be steep and unforgiving if you are not technically inclined.
Details and pricing for VPS service management are available here.