I did the same force press on my iPhone and the display model at BB - neither have this creaking. So, I am getting mine replaced as I fear this is a manufacturing defect. When I spend that much on a new technology product from a company the likes of Apple, I expect flawless.
Nothing is perfect. That's life. Though I do agree that you should expect quality. How hard is the user pushing? That changes the evaluation of the problem quite a bit, hence why I said what I said at the end of my post.
If the user is pushing hard, of course it's going to give. If the user is resting their finger on it and it squeaks, there's clearly a problem.
so you're pushing it wrong? c'mon! If any part of my $400-$800 device squeaked that thing is going back where it came from. I bought an iPad not an old door.
An iPad has a different function to a door. If a door squeaks whilst under normal use, you oil it. An iPad isn't meant to squeak, I get that. However, the iPad is also not meant to be pushed hard.
See my above responses. OP really needs to give a bit more information. Are they pushing hard? Soft? if hard, it's not a problem since you're meant to tap the glass. If soft (as in normal use), there's a definite problem. This is similar to the person compaining of light bleed when they twist the iPad 2. I get there's light bleed but why in gods name would you twist it?!
OP, could you post some more info please?
Update: Just noticed the OP edited their post to include how hard they were pressing it. Medium firm. The iPad requires 'taps' to function. You have it flat on its back and push 'medium firm' in a weak spot (corner) then most, if not all, of our devices will do this.
OP, feel free to get it checked out at a genius bar just in case but from what you've written, I wouldn't worry. Just reduce the force with which your pushing the iPad screen. Unlike some other touch screens, it doesn't need to be 'pushed' at all, just tapped. I get the opposite problems when I use some touch screens - they don't work until I push them!
If I'm misunderstanding the issue (it could definitely be lost in translation due to subjectivity on force of presses, feel free to make a video and show it. If it is indeed an issue, you'll be helping lots of us here spot it.
p.s: Long post I know. If my reaction seems unwarranted to some people, I work where I demo these devices with people. 9 out of 10 people push the glass hard instead of tapping it and ask why it 'rainbowed'. They have to be told to gently tap. No judgement for doing that, since many touch screens function this way. People just need to be informed sometimes that they're pushing a bit too hard. (zing!)