Unity Master Server - Good to use?

The few threads I can find on the elusive Unity Networking Master Server were from 2008/2009, mostly of people complaining of stupendous lag.. Is the master server usable now? Is it good to use or is it as laggy as back then?

Unitys master server is for testing purposes. You should host your own server for your published game.

Unity Technologies also has a fully deployed Master Server available for testing purposes and this is actually the server that will be used by default.