- 2011 MacBook Air i5 13.3" - still runs well on OS X 10.11. Works well casting video to Chromecast.
- 2011 iMac i7 27" - has gotten slower and slower with each OS update, upgrading to SSD a year or so ago fixed that. Now runs very well with OS X 10.11.
- 2012 iPad mini - deceased due to digitizer problems. Got slower and slower with each OS update, also, could not keep more than one webpage tab stored in RAM at once. Was planning to upgrade it anyway due to the performance, but the "ghost touch" on the digitizer made it unusable. I will probably get a refurbished iPad mini 2 to replace it (it has twice the RAM and shouldn't have as many problems keeping webpages cached).
- 2015 iPhone 6S - this replaced a Nexus 4 with a dying battery. Still works well, obviously.
The desktop and laptop seem to have better longevity than the mobile devices. I will replace the mobile devices when they break or when running the current OS makes them too slow. The desktop and laptop still perform very well and look like they will have several more years of usage left. Similar newer Apple desktops and laptops seem to benchmark about 50% higher than the ones I have, which is not enough for me to consider an upgrade. Honestly, when the time comes, I could see replacing both the iMac and the MacBook Air with a midrange 15" Dell laptop. At that point, I might upgrade to a 10" size iPad, since I would no longer have an ultraportable laptop to travel with.