Di Box For Guitar... Options

[musico2007]

does anybody here use a DI Box(Direct Input) when connecting your guitar to your interface into your computer to record? I've been connecting my guitar directly into my M-Audio Mobile Pre-USB interface and then using some sort of guitar amp simulator on Logic but I'm wondering if I have to use a DI Box? I heard it changes your unbalanced input into a balanced one so it seems intriguing, i just wanna know if anybody else has any experience with them? and would they recommend me getting one?