I came across this thread in a google search because I'm considering the exact same options right now, so I decided to register. I haven't seen the monitors yet.
From what I understand, it's only the ColorEdge series from Eizo which are hand calibrated at the factory. This is why the things cost about 4-8x more than the S, L, and M models.
The S2410W does, however, still have internal 14bit color calculations and 6 color controls. It also has neat little things like electrostatic buttons and brightness stabilization like in the powerbooks, and of course the 5 year warranty. I'm also expecting the Eizo to have a more even backlight. I doubt the Samsung will be bad, but it's just something I'd expect Eizo to put extra effort into.
For only about $200 more, I'm leaning heavily towards the Eizo. But then, if you buy before I do in February-March, I'd love to hear some critiques on whichever you choose.