We've got 2 pairs of 2000FP (the first of the 20" flat panels) and another 2 pairs of the 2007FP (later generation 20") and I am very pleased with them.
Okay they're not the cheapest, and the early ones are pretty thin on toys (no USB and non-adjustable stand) but given we bought the 2001FPs in 2003 and one has only just failed, then 7 years ain't bad.
As Matt says, the height, tilt, rotation and aspect adjustability are great, and the USB features are definitely a bonus.
I've also noticed that on all 8 monitors there are no dead pixels. I understand there's a given tolerance for dead pixels, but to get 8 over the years with none at all seems better than most.
I believe the warranty is 3 years, and in my experience Dell monitors easily exceed this.