I bought a 213T and love it very, very much. I found in my searching overall much more complaints after purchase with the Viewsonic than Samsung lcd's. And then I heard NEC sued Viewsonic for lying about specs. Apparently NEC's claim is that Viewsonics specs exceed the specs of the supplier of the panel itself. Having checked a few of their source panels I've always wondered why they had "better" specs than the parent panel. Oh well, I guess NEC had enough and put the lawyers to work.
Anyway, these days most 20+ panels from major vendors are pretty darn good imo, but when I had to put my money down, I went with the Samsung for reassurance. I got a 21" panel with superb response even in games, great dark scale reproduction and zero pixel defects. I'd highly recommend it.