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Over the past three years, we replaced 150 legacy applications by Odoo. We use Odoo for several of our most complex and visible processes: HR, budgets, assets management, road infrastructure, universities, inventories, etc. It allowed us to cut our budgets by 70%, for a better system!
-- Official Press Release from European Commission   
The more we learnt about it, the more we realized how pure the system is.
In Kosovo, starting from nothing in just 1.5 years, we built the system of:
1. Franchise of largest courier provider in Europe.
2. The second largest ISP of the country.
3. Largest fitness network in the country.
4. Two largest municipalities, including capitol of Kosovo.
This is how effective Odoo is, and from my point of view as a software architect, it's the best open source platform ever done.