I don't own one, but finally got to play with the iPad 2 at BB today. Impressions - sexy, fast, and a worthy upgrade.
The form factor is amazing. It's so thin compared to the original, and really makes it easier to hold with one hand. I don't think it's much lighter, but the weight distribution makes it feel like it is.
I played with a white one, while the woman next to me used the black. The white looks really great when it's powered off, or on the home screen. When using it though, I felt the OS and white frame clashed. With the black border, the OS seems much more fluid, and blends into the device, drawing the user in.
It's also considerably faster than the original. I was switching between apps, loading sites, playing games, and taking pictures, and the iPad 2 didn't even stumble. It was so much more consistent than my iPad.
I'm still not sure if I'm going to upgrade. I use my iPad all the time, but I think I'll wait for the next revision and retina. That being said, this is an awesome device, and the new version is definitely a great buy.