Rooting Asus Transformer Pad 300

You can get a unlocked boot loader from ASUS.
Means you will not get any updates when they push them out.

I haven't seen the need to root mine.

It's under utilities on this page

http://support.asus.com/download.aspx?SLanguage=en&p=20&s=16&m=ASUS%20Transformer%20Pad%20TF300T&os=32&hashedid=8BmzkQ4yoz5WzBrW

Unlock Device App: Unlock boot loader.
Notice:
1. Only suitable for Andriod4.0 Ice Cream Sandwich & Jelly Bean OS version.
2. Before you download, install, and use the Unlock Device App you acknowledge and assume complete risk to the quality and performance of this App, including but not limited to the following: once you activate the App you will not be able to recover your ASUS product (?Original Product?) back to original locked conditions;the Original Product with the activated App will not be deemed the Original Product; the Revised Product will no longer be covered under the warranty of the Original Product; the software of Revised Product will no longer be deemed the software of the Original Product and can no longer receive ASUS software updates; your purchased digital content may also be affected.

You also acknowledge ASUS does not guarantee service satisfaction to any Revised Product, including events involving paid service requested by you to be performed to the Revised Product.
Furthermore, such repaired Revised Product will not be covered under the warranty of the Original Product; the software of the repaired Revised Product will not be deemed the software of the Original Product and will not receive ASUS software updates.
It is strongly advised that you avoid activating this App unless you fully understand and accept the risks that may arise.

※This tool now only works with TF300T ICS & JB of TW,US,WW CN SKU. It won?t work on other devices.

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JonnyCam