Having seen the DDI, with its Compendium and the CB, it seems to me that I don't really need to buy any more sourcebooks, since everything will be included in the DDI. I'm not talking of course of adventures or campaing settings, but splatbook like Martial Powers.
So my question is: for someone that owns Martial Powers and has a DDI subscription, what is the added value of the book version? Is there anything that will be left out of the Compendium? Do I really need to buy the book or will I have all the infos needed through the DDI??
Thanks in advance for any answers!
PS: I think that the Compendium and the CB are the best things ever created for D&D!
So my question is: for someone that owns Martial Powers and has a DDI subscription, what is the added value of the book version? Is there anything that will be left out of the Compendium? Do I really need to buy the book or will I have all the infos needed through the DDI??

Thanks in advance for any answers!
PS: I think that the Compendium and the CB are the best things ever created for D&D!
