So has anyone upgraded to Yosemite yet, I took the plunge, I really like the handover feature, and am using it quite regularly now. All hey need is a whatsapp for the laptop and I would be content.
I have been using Macs since 2008, and have never had a significant problem with an upgrade. With Yosemite, the only glitch was that my printer was about two weeks away from having a driver for Yosemite, so I couldn't connect to it wirelessly until they upgraded their driver. As compared to Windows upgrades, Mac upgrades are a breeze, and a whole lot cheaper.