Advantages:
Go compiles very quickly.
Go supports concurrency at the language level.
Functions are first class objects in Go.
Go has garbage collection.
Strings and maps are built into the language.
Disadvantages:
The packages distributed with Go are pretty useful, but there are still some libraries you'll miss. Most notably a UI toolkit.
There is no support for generics in Go, although there are many discussions around it.
Other points of note that could be advantages or disadvantages:
Go compiles to machine code.
Go is very strongly typed.
Go is not object oriented in the traditional sense.