Cheapest Android 3.0 tablet so far, with nice spec. Cheaper than Ipad2. While some would say Ipad2 is a lot more better app wise, I think it is merely a matter of preference. I have own Ipad and I have own Android devices, I even own a Windows 7 tablet - Acer Iconia right now. There is not a single tablet which is excel at everything that the others do not.
Ipad -> sleek UI, Apple does a good job in their own apps they offer such as iBook etc. However, not enough video format support, cannot playback 1080p video smoothly.
Android -> Handle every video format fine, and does 1080p playback smoothly. Lots of choices, lots of different sizes and prices. Plenty of free apps which in many ways rivals what Apple store can offer. However, UI feels slightly sluggish especially on 3.0.
Windows 7 -> Lots of existing and familiar applications that can run on it. USB ports do everything you expect it to do. However, bad battery life compare to Ipad and Android. Navigating the UI is a trial and error affair as it is really designed for a mouse. Good thing is it is easy to use it together with a wireless/bluetooth optical mouse. Microsoft should learn how to create a more un-obstructive onscreen keyboard interface.