I got Zagg because I used them before and swear by them, and also the local Best Buy will install them (9.99), with the guarantee that if they screw it up, they replace it with another for free! I can never get screen protectors etc. on straight - and I am very picky about dust etc under them.
I can't count how many I have had to scrap and put another on just because I noticed a bit of dust that showed up on light colored screens! Best Buy will only install the Zagg ones (they had an actual course on how to do it properly)
Anyway, here is someone's chance to get one for 20% off the Zagg online store. .... well 2 people actually.