Its brilliant, having experience with few ERPs in my 20 year career I found Odoo is the best.
Partner! partners! partners. No business experience, very young developers with no experience, a lot of customization that make odoo worthless afterwards, a lot of mony to implement and customize.
It perfectly supports Importing, exporting or migration from another ERP. Transactional control, tracing over network is available, secured platform for business.
Second thing is when there is any error in py file sometimes it fails to give exact error.
I love the most is the business function inside odoo, its object link with each other such as sale, inventory, and a lot so on, I have been using this until now i want to be a partner with odoo.
The initial implementation was painful to say the least.
Personally, I'd love to be a contributor to the Open Source portfolio of features and products (if only I had the time).
The time it took me to learn how to use it and to training my teams but I feel it would be the same with other companies or even worse.