I bought (2) Dell 2005FPW’s recently (20-inch widescreen). I’ve been pleased.
Their response, however, should be the same. The 2005’s and the Apple 20″ both come from the same factory, but are just packaged a little differently.
Personally, I prefer the 2005 because of the variety of inputs (DVI, analog, S-Video, and coax) and the (slightly) cheaper price. It has 4 USB 2.0 ports on it vs. the Apple’s 2. It does not, however, have any firewire ports, while the Apple has 2 firewire 400’s.
Just my two cents.