Using Google Sites for systemisation

As I have mentioned before I use Google apps for business that I think is great. I am progressing with systemisation. I am thinking of using Google Sites as my intranet to store all systems information. This includes procedures and  forms, basically all matters not directly related to the client.

I have recently come across Google Sites. It is part of my Google apps for business package. Only £30 per year per user. It really is a no brainer.

Has anyone used Google Sites? What do you use it for? Any good? 

Any views on using Google Sites as intranet/systemisation storage?