Be prepared to get used to the different look sensitivity. Xbox is locked at 30fps so the camera movement feels a lot different to on the PC (even at the same 30fps). Once you get used to it it's fine, but I do find it's a lot less accurate at first, and I seemed to overshoot how much movement is required. I guess you could call it more "laggy", but like I said once you're used to it it's okay, just a different feeling.
Also, remember to keep even more saves as you can't use the console to fix any issues you experience. Graphics are good and the game still looks stunning, obviously not as good as a high end PC but still solid nonetheless. Textures are worse and so is medium and distant detail, but lighting is more or less the same. Loading times are much, much longer than a decent PC, so be prepared for that; I suggest you do something constructive whilst waiting

Also mods aren't available which can be a major setback if you're used to being able to change and add things at will (including fixing bugs). Overall whilst the PC version is obviously technically superior, once you get past some issues (which may or may not be of grave importance to you), it's still a fantastic game regardless of the platform.