I am not a fan of motion controls...Never will be....and I will likely never purchase this....That being said, it's in another league beyond Natal and WiiMotion Plus, and I don't know how anyone reasonable would disagree. Natal is just waiving ur arms and feet around, so basically you can play one game (knock balls down being thrown at you) WOW. That's it. It was like using a bat to perform brain surgury. I mean that attempt to paint was a joke. The new PS3 motion is like a WiiMotion Plus Plus. It appears to be far far more precise. Using the EYE and the tracking ball makes it a lot more precise than a little infrared reciever. Also using the EYE means you can use all the features of Natal with even more precision that WiiMotion plus, and buttons.
That being said...I will never buy it. And this will definitely never become the standard for 99% of games for the PS3.