When the Transformer Prime was announced with a locked bootloader, there was a lot of screams in the community and after all that screaming, ASUS announced that there will be a bootloader unlock tool the next day after the announcement. That bootloader unlock tool has now been finally released by ASUS and despite releasing the unlock tool, ASUS has something to say about it:
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.
So there you go, don't say ASUS didn't warn you. For everyone else who is still interested, head on over here to grab the tool.