I've also had it on my 5th Gen Video iPod for years, and I can still peel it off & sell the iPod on e-bay as "In Pristine Condition" in spite of constant use of in car use with the Kensington plug-in device (since the "grippyness" keeps it from sliding around even in the turns) and in & out of my several Altec Lansing Speaker devices scattered around the house, or taken to parties.
Best $20 investment I've ever made... I'll get one for my iPhone ((...as soon as I get one... ))
i use a thin rubber case. the nice thing about it is that i can set my phone on the counter and if something spills then my phone is protected. i also use a screen protector. however, the top left corner starts peeling away within a few days even though i replaced it because that happened previously -- and i clean the iPhone perfectly before application. hmmm.
i have to read Neil's review and others to see how well the iPhone grip works with the invisible shield since that's my biggest concern when pulling it out of my pocket or worrying about it getting easily knocked off of a slick counter.