Actually personally having so many Android phones and iphones and present Windows 1520 , I had never believe in using SP>>>It is to me a total waste of money. Most modern smartphones comes with scratch resistant glass and unless you purposedly scratch it very very hard the chance of a scratch is not possible. Normal stuffs as keys, coins in your pocket will never scratch it unless you have sand particles inside your pocket. I even demo on youtube scratching a Note 2 display with scissors, blade dragging it across display and there was no scartch.. You can find many such similar youtubes on display glass being scratch by hard objects and all will show no scratches
SP is for those who are really kiasu I'd say and since many users uses a covered case, SP is not useful at all. Out of curiosity and seems to be the in thing, I have decided to try on a Momax Glass SP ( my first one) on my previous Note 3 but subsequently removed it after a week as I just cannot stand to have another layer of material on the glass. I also tested one glass SP ( cheap brandless type ) on my XZU but I sold off the phone about a week later . Both convinces me the glass SP is not necessary at all
Pessimists will urge you to protect your phone with a SP is a must ... so follow their advise if you so wish to.. they will argue why save the RM50-100 since the phone is already so expensive. Seriously I would use the money to buy a better case than a piece of flimsy plastic sheet
SP is a big profitable business and target to those users who are "scared" that they precious phone will get scratch!!