I recently bought an early 2015 13 inch MBPr. De screen damaged really quickly (while using the micro fibre cloth) because of the staingate thing so today I had the screen replaced at Apple for free. I bought a cheap 3 euro 13 inch screen protector as safety measure. It has a lot of bubbles. Is it worth it to buy a better, more expensive screen protector? Or are the new new screens (and coating) strong enough to not scratch while I clean he screen? The guy at the apple store said they use alcohol to clean the screen which I did as well before applying the screen protector and it worked pretty well and didnt damage the screen this time. Anyone having experience and tips on this subject?