yes,putting stiker will make ur case look cheap especially for expensive case unless u want to hide hideous scrath or bent..... i don't putting sticker on my rig,unless the oem hardware sticker.....
but airbrush on case is good and looks more cooler....furthermore plastic sticker will become yellowish on the long run and the sticker glue residue will make case look even ugly..

only oem hardware sticker...but plan to put transformer sticker...where could i find good quality sticker?