I bought my 2408WFP specifically because it can be rotated, but I never actually ended up using it in portrait mode. I figured a portrait display would be better for viewing code, but in practice I couldn't get used to such a tall display; it was too much strain on my neck.

I have an ancientish 2405WFP. 24" monitors are too tall when rotated, but 21" ones aren't.

I hate rotated monitors. I love the dimensions, but the way the LCDs are designed, I just can't get a good crisp picture for the full length of the monitor. Now, if a company with design a 9:16 or 10:16 monitor instead of 16:9/16:10, I'd buy one up in a heartbeat.

I have this problem with the 24" monitor I have at home, but the 21" i have at work next to my 30" is just fine. I think it varies a lot by screen.