It depends on your project. I used Go since 2011 on multiple projects, two of them are http://github.com/chrislusf/seaweedfs and http://github.com/chrislusf/gleam. One is a distributed file system, the other is a distributed computation.

* Refactoring is powerful

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Nobody can design well upfront for a large project. Constant refactoring is need for large projects. Go is super good on this.

* Generics is not ready yet.

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The distributed computation project was re-written multiple times. I tried different approaches to address the generics problem. I even tried to make it work fairly well with LuaJIT, but still decide to change again due to the need to learn a different scripting language and losing the type checking.