There are definitely upsides and downsides. The vast majority of our systems are RHEL6, because that's what a vendor of ours supports. Since we have the infrast

There are definitely upsides and downsides. The vast majority of our systems are RHEL6, because that's what a vendor of ours supports. Since we have the infrastructure around to support RHEL6 (puppet modules, vm templates etc), most of our supporting systems are also RHEL6. If we need newer features or packages, we spin up a CentOS7 or RHEL7 image which still isn't bleeding edge, but is significantly newer than RHEL6. It's nice to have a bit of stability for apps and services that require it - but there's always the option of bringing newer versions online for the services that need it.