I've had it on my iPhone 4 for awhile now and I bought the incredible shield ultra matte series. So far it's been fine to me and the screen protector doesn't leave residue at all, there was a time where dust was underneath it and I just used tape to lift and remove the dust with another piece of tape. I don't know if you guys are taking care of your ipad/iphone but I don't have any scratches on the screen as well.
I put two different oleophobics on my iPhone 4 from sgp and both had deep scratches within a week. I take very good care of my phone. Switched to power support and haven't had a scratch in 3 months. I will say the fitment of the sgp protectors is perfect. Even better than power support.