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I have the Invisible Shield, front only. It's been great so far, though there is a single imperfection on it. Thinking about sending Zagg an email about it to see what I can do.
I'm using the one that is included with the CandyShell case. No bubbles at all, but there is a little bit of lift near the button at the bottom and near the speaker at the top. Not sure if it is the installation job, or the protector itself causing this. Otherwise, can't tell that it is even there.
You'll be able to tell after a few days - the Speck one I had scratched up really bad.