This tablet easily rivals the iPad2. In terms of functionality and boot speed, pre-loaded with a 4.0 kernel (although I downgraded, keeping the OpenGL by adding ClockworkMod) auto adjusts between portrait and landscape mode with superior transition than the iPad2.
The only thing the iPad2 has over the Galaxy 10.1 is the screen. The weight and slimness of the 10.1 feels great in your hands, and if overclocked is beyond fast. Supporting flash and openGL, the Samsung tablet is the best tablet around... FOR NOW!