Good thing they don't come with the keyboards otherwise no way could I resist.
I bought mine new with a keyboard. Used it for a couple days, and it has been undocked since. Haven't had a real need to write anything longer than a few sentences on the tablet. nice to have, but I don't think you'd really miss having it since it's more portable without the extra thickness and weight. If you really had to write something long, you may as well just connect a regular keyboard to it.