Heh, I have one. Got one for 20 bucks... but he' right.
It is big but not as big as a desk. (yes I picked up ur sarcasm)
If you've seen the internet pro keyboard with the wrist rest (which I suggest u use) it is only slightly bigger.
I find the cut, copy, paste and back & forward buttons AMAZING. Cut copy and paste help soooo much.
The buttons on top aren't THAT impressive.... i don't use them that much since i set up my desktop to be really efficient.
A neat feature i like is that they split up the "F-keys" in groups of 3 rather than groups of 4. This makes it so much better for games since it is easier to feel for the specific F-key you want.
Another nice addition is the "undo" and "redo" buttons. I guess its more effective if you do photo editing or something.
Oh and last but not least....
The whole set of keys above the arrow keys are rearranged in a way that makes it useful for work, but less useful for games.
They arragned it so that the delete button is bigger (which helps for work) and they took out the "insert" button and moved it above the number keypad. So when games use these keys and consider it a box of 3 X 2 keys, you run into problems since it is now a 5 buttons set, and vertically arranged. (I just reconfigure keys then).
Other than that, the key quality is the same as other microsoft keyboards. Soft, not silent but makes a noticeable pressing noise, and quite comfortable.
It IS big, but I also have a Sony 18" LCD to make up for that.

But then again, if you compare it to other keyboards, it isn't that much bigger.