Is there any big difference between branded and unbranded screen protectors for the iphone 4. I considering the Power Support but its x 15 price of 'generic' protector that also has cut outs etcs. i want scratch resistance but want to maintain the brilliant screen. Was thinking of branded front protector and cheap back protector. I ask because i think these things are so over priced. All apple stuff is over priced - its ridiculous. I dont mind paying for quality but not for bits of plastic. Any opinions?