Well I have noticed if I hold my surface on the top left and put a little bit or pressure on the glass I'm
hearing a bit of a click sound. Nothing really seems loose but I'm wondering if that's some thing I should exchange over..... The rest seams very solid.
I'd exchange it. I had some issues with the hardware of my RT, and MS was very good about replacing it -- they want users to be happy, they want us to have as close to perfect an experience as possible. I think if you didn't exchange it it would probably bother your like a thorn in your side for the rest of your life.
Maybe a little exaggeration but you know what I mean.
I just replaced my Asus Taichi because it has a loose trackpad. I am 10,000 times happier with a perfect piece of hardware. That is the way it should be.