Apparently, Apple has discourage the use of palm guard protectors as it will damage your screen.
Apple has warned against the usage here: http://support.apple.com/kb/TS4384
Products Affected
MacBook Pro (Retina, 13-inch, Early 2013), MacBook Pro (Retina, 13-inch, Late 2012), MacBook Pro (Retina, 15-inch, Early 2013), MacBook Pro (Retina, Mid 2012)
Symptoms
Leaving palm rest covers or other material on the palm rest surface of your computer could result in damage to the display when you close it.
Resolution
To enable thin design, the clearance between the display and the palm rest area is engineered to tight tolerances. Do not use palm rest covers as the added thickness may interfere with the designed resting position of the display.
As a best practice, keep the palm rest clear of any material.
So this is what happens when i start to peel it off.
Don't say Apple haven warned you yet! Look at the last line.
Argh! Just peel it off la. Feel like the whole area dislocating. What the SHIT! Only the matte surface came off.
Okay the next layer, it's sticks to the aluminium even stronger..
Peel and Peel
Finally! Everything off! Fuck this shit.
The stain is all over the place.
In the end, i managed to get rid of the sticky adhesive, but it's an awful experience, i would recommend anyone who are into 3rd party accessories to just keep your macbook clean and save the money.
Feeling utterly disappointed. I went on to remove the keyboard protector which causes me to have awkward typing and it sucks anyway. The screen protector which defeats my purpose of a retina display.
Freebies and really just freebies.
Lesson learnt. Enjoy your Mac like i do. Apple designed this beauty to be used like this.