But are they light? can you write something on them while standing for example (tablet resting on one arm) one of the reasons I am attacted to the origami is that it seems less cumbersome than Tablets
Some of the convertable ones are rather too heavy in my experience and a little bit too bulky to use for any significant period of time. I've got a HP TC1100 and I still swear by it as the best designed Tablet ever, the detachable keyboard gives you all the
advantages of a convertable and a slate at the same time.
The best advice I can give you is to try it out and see how it feels. Buying from somewhere like PC World should at least give you the opportunity to hold it in your hands first and see how it feels.