My pass phrase is 44 characters long and includes both lower and upper case, numerals and and a few non-alphanumeric characters. It's super easy for me to remember, but would be very hard for anyone else to guess or brute force attack.

The only error we received from the iPhone was that it couldn't connect and my best guess was something was mistyped in the pass phrase. If I could have verified it was typed correctly, then I could have gone onto other trouble-shooting steps.

With a clear text display it would then have also been possible to restore the form with the text that was just typed, making it easy to correct instead of having to try typing the whole thing again.