PC desktop with 23.5-inch Display
13-inch Macbook Pro with Retina Display
iPad Air 2
iPhone 5s
iPod Nano (6th generation, front glass got cracked but it is still functional, best iPod IMO)
Most of the software I use are with cloud sync, and I would save my not-so-private documents on the cloud. So interoperability is not really an issue for me. I can simply pick what I feel comfortable to complete my immediate task at anytime, eh, if I have the devices nearby.