Can you take videos shared in itunes off your computer? I want to know before i buy the share to itunes

Yes you can, select an video in List, click share in iTunes(In-App-Purchase), then connect your device to computer, launch iTunes on computer, go to apps section, scroll down, find MediaBurner on left list, click it you will see the shared video, you can save the video to your computer, then copy to any device you want  from computer.