So long as it has that sweet sweet lamborghini countach poster on the wall, i'm sold.

I recall being my most productive on an old IBM 3151 terminal (probably because of the keyboard, but also fewer distractions). It was only 80x24 characters. And 80x24 is easily represented in a 640x480 screen. Now add in head tracking, and you can have the screen move up and down and scroll the text in the opposite direction, making it appear as if you are moving a virtual picture frame over a bigger sheet of paper.

Even today, most of my (C / Bash) programming is done in an 80x24 xterm, although I'll typically have documentation open in another window. However web and GUI app development requires enough room to see the resulting product.

Although I have much higher resolution, lately some occular migranes have forced me to up the font size on my monitor. Having really big type seems to stave off the migranes for some reason.

Anyway, I think I've been going for about a month and a half with 80x27 text displays (full screen with tmux). I'm doing web development and my browser is similarly scaled (thank god we're building something with a scalable UI).

I have not missed the screen real estate at all. Of course, I'm old and I used to always work on 80x25, so the extra 2 lines are luxury ;-)

For one of my projects, I am writing code Thet is meant to be read by the 99%, i.e. formatted to be readable on a phone. 40 chars wide, and I rarely look at more than 10 lines at a time.

It's generally fine. Every now and then I feel like I want to see the broader context of the code, but it's rare. In general it forces me to write much cleaner, more readable code, and to structure things better so that concerns are truly isolated and I don't need to look at a lot of code to see how things work. Overall I think it's a positive experience.