Odoo V8 is a major upgrade. With Odoo V8 OpenERP is moving into new territories, beyond ERP. Odoo V8 released an open source CMS, a disruptive eCommerce and a Business Intelligence.
Why RVM (and not native ruby packages)
There may be debate, but I have found that for a development system, it is increadibly easy to use rvm, with it’s different ruby versions, different gemsets per project.