IMO, it's strongpoints are nice streamlined ergonomics (more pleasant than I've run across anywhere else so far), crisp picture quality through the DVI input, and the 450 cd/m2 brightness.
I can't overwhelmingly recommend it though. The viewing angles are weak, especially vertically. There is a noticeable glow around the edges of the screen, especially when working in low ambient light conditions. And I wish the blacks (contrast ratio?) were stronger. I thought a widescreen LCD would be cool, since most of my apps involve widescreen video. But after using it for awhile, I think I'd prefer the additional resolution (the 172W is only 768 pixels vertically) and headroom of a 4:3.
I haven't seen the Samsung 172T firsthand, but the specs on it look better than the 172W with respect to the above. According to reviews I've read, it has much wider viewing angles (170 in both directions), better contrast, and finer pixel pitch (~.27 instead of the 172W's ~.29) which are my main gripes with the 172W. Both models run about the same cost, so my inclination would be to go for the "T" over the "W". The max brightness on the 172T is lower than the 172W, but I rarely find myself using that high brightness.
If you're seriously interested in a widescreen display though, I think there's a 17" Viewsonic model that looks better than the 172W, but at higher cost. And it may also have some video inputs on it.
I don't know how the Samsung 172T would compare to the NEC or Dell though.