Bad thing about the Atom is the CPU might be faster than a Tegra 3, I'm not so sure about the GPU. It really struggles with a lot of 1080p videos that Tegra 3 tablets have no problem with. Maybe it's just the drivers, I dunno. But I'm pretty disappointed with the video playback on my Atom based Samsung Ativ Smart PC 500T. Though overall I still like the Atom, because of the great battery life, it stays cool, and has no fans, and is lighter.
Though I'm uncertain the 11.6 inch size with keyboard was the best choice. It makes a nice netbook, but a bit on the heavy and awkward side when you undock it and use as a tablet.
I'm undecided still but I'm thinking about returning it for an ASUS Vivotab Smart, the 10.1 inch Atom tablet they have coming, soon hopefully.