This is my kind of screen. I have an X220 on order so time will tell whether I'm right. About the same upgrade price in Euro-land. I do not like high-resolution screens while there is still software and web-sites that won't scale properly. Having high-resolution available should not mean you have to squint all the time (those of us with lesser eyesight). If/when screens ever move up to printer resolutions this will go away, meanwhile in today's market you have to chose between pin-sharp and squinting (with my eyes) or larger and blurry or with other scaling (or lack thereof) issues. I'm grateful for higher quality, but lower DPI screens.
If i had a choice between great samsung TN panel
with 1600*900 resolution, and IPS panel (unless it is significantly better than IPS HV121WX4 people installed in their X200/X201) with 1366*768 resolution, i'd choose the former any day. I'd even pay maybe $200 extra to get that high resolution while having an acceptable viewing angles and good (better than IPS) contrast, brightness and saturation (yes, i use my X200s primarily for software development as a work horse, web browsing while at home, and movies on the go).