No. Many of those tablets have features (eg, rectangular shape with rounded corners) that are supposed to be not obvious.
It's more evidence that a lot of iPad is evolutionary not revolutionary. See also PDAs which contain a bunch of features which are covered by patents. (a big menu button at the bottom centre of the screen).
All of them have either a stylus, are cluttered with buttons all over the place or have a stock WinXP which is totally useless for touch.
For these reasons, all of them failed terribly and nobody bought them. I haven't seen one of these IRL.
I see my point proven, so thanks again for the link.