I've had one since September. One of the first things I heard was that it was inexpensive because it's low resolution: 1280x768 isn't that much, especially when the previous PowerBooks had 1280x854. Also, it only supports 16.2 million colours, not 16,777,216, as most displays support.
I really like mine. Is it a substitute for a 20 inch Apple LCD? No, but you can afford two of them and still have change for an iSight or something else.
One thing I really like is that it's so good in bright light. Movie playback is good and the display seems quite responsive, though I haven't looked at the actual response figure. UT2004 and associated games based on the engine will work in widescreen with a little text editing. Quake III and its engined-based games will play in stretched mode.
My photos on my desktop background are more easily seen and my graphic design tools are further over and more of my photos are displayed during editing. Still, I have to adjust my technique to match the change in colour fidelity. The 5 year old 1024x768 LCD was said to have 24-bit colour depth but I think it was more like 8-bit colour depth. However, it was closer to real life than this one is, so I changed ColorSync profiles from standard to Adobe RGB 1998.
By the way, there is no video cable included and Best Buy charges over $50 for a DVI cable.