Yes, Unity Free lacks render-to-texture so Gamestudio Commercial has an advantage if this feature is important to you but Gamestudio doesn't come with good dynamic shadows in any edition. Like has been discussed in this thread already they theoretically could be added by yourself but it still seems like nobody has been able to achieve that. All attempts so far are missing something.

@ello: Preorder pricing will end the day Unity 3.0 gets released.

@Pappenheimer: Object oriented programming isn't very hard to learn if you use an easier language than C++ for learning it and like Captain_Kiyaku has mentioned it isn't really necessary to know much about it for programming with Unity.