I agree! I have it for ca. 4.5 years now with i7 processor and 512M SSD and it still delivers. I carried out CAD related developments on Windows in a VM and it was pretty satisfactory (except big or computation intensive cases but average desktop was in pair that time). I had to move on to more powerful desktops yet I still use it for this and that. Its size is still the perfect ballance to me in usability and portability and feel no urge to replace it yet.

Have one roughly the same age and I still use it all the time at home. Run out of space a lot, though; 128GB is far too small.

If there were a pro with an SDXC reader, headphone jack, bar, dedicated function keys, and 32 GB memory, I'd get that.

The main problem I have with the macbook/air/pro is the edge not being rounded and digging into my wrists.

Using it for 20,000 hours would be approximately 12 hours per day for every day since 2012. You must be working hard :)

I have one of these (two years newer) as well, but two things are pushing me towards an upgrade: the lack of support for multiple external monitors, and the lack of 4k support.

The somewhat anemic processor can be a concern as well. It in indeed capable of editing movies, but any major conversion jobs can take a lunch break to complete.