We are running a V8-version of Odoo in a live environment.
We always wanted to update to V10 - but as now V11 is coming we look forward to update to this, latest version then.
Our current version is mainyl used for ecommerce ,inventory-management, invoicing, production and customer-database. Other Apps are installed - but not heavily used.
It would be preferred if all Old data - including customers, accounts, invoices, etc. pp can be transferred. Our Odoo also runs in french language - this should be working for the V11 as well.