If you think about it their pretty cheap too. Remember paying 2K for a monitor back in the 80s? It's basically the same price once you factor inflation.
The T221 is a great monitor for coding -- check out the size of the "fixed" font on the wikipedia image. But with most configurations it only does 12, 24 or 48 Hz depending on how many DVI channels you can use. Also, since it is being driven as four separate 1920x1280 displays with xinerama there tends to be tearing across the boundaries with movies or video since the refresh from the cards is not synchronized.
Other than that, I love mine and am considering a second one for dual head using eight DVI channels.
Also, http://en.wikipedia.org/wiki/IBM_T220/T221_LCD_monitors
201 DPI for the T220/221.
If you think about it their pretty cheap too. Remember paying 2K for a monitor back in the 80s? It's basically the same price once you factor inflation.