I bought an iPad 3 screen protector and 2 for the S3 last time and I messed up the S3 one (ended up stretching it) so I had to throw it out.
The iPad 3 screen is ok but I wouldn't buy from them again.
It wasn't tough to put it on (I basically dipped it in soapy water and let the water run down) but once you got it aligned and to the squeegee part, it up getting the marks from where I pressed down.
The bubbles did come out but there's indention marks on the protector where I moved the squeegee card and I wasn't even pressed that hard. But besides that issue, it sticks well and didn't peel until I peeled it off myself a few weeks later.