At the os level I have only had a more stable system with every OS upgrade. Wifi is back to its old happy self with the last few patches and seems more stable,

At the os level I have only had a more stable system with every OS upgrade. Wifi is back to its old happy self with the last few patches and seems more stable, Yosemite early days it was a bear I will give you that. What I have found is that some things just don't play nice with the OS. Openvpn is kind of a bear and I'm not sure what the underlying cause is, but its easy to kill and restart so not a major issue there. I do regular heath checks and cleanup though. EtreCheck is a great way to get a look at all the cruft in your system and make some calls on what to clean out/up!