[Users] It is Ok using OVIRT in production environment ?

Hello, actually we have a cluster of RHEV nodes, and other one cluster with vmware nodes. I'm so excited about the works that community are doing with ovirt, but all of my sysadmin said me that cannot be used in production, because there is not a very stable release and because they need to spend too much time in upgrading node and manager. What do you think? Thanks Marco