Is Nvidia�s Optimus the Best of Both Worlds?

"Laptop shoppers no longer need to be faced with the unenviable choice of long battery life or powerful graphics. Notebooks with Nvidia’s Optimus technology attempt to deliver the best of both worlds by seamlessly switching between two GPUs—one discrete, one integrated–to give you plenty of oomph for playing the latest titles as well as close to all-day endurance. And unlike previous switchable graphics laptops, there’s no need to flick a switch or deal with screen flicker. It all happens automatically."

Seems like a pretty cool idea.  If it appeals to you, LaptopMag has a rundown of their top five machines featuring this technology.  More importantly, have any of you picked up a machine with this feature?  If so, is it all it is cracked up to be?