I found that i had to open and then refold the banner quite a few times to make the appearance smooth when i first got it.
Even now after a years usage I still open and close it before a show so I'm sure it will open without ripping. Having it packed up and folded for a while and then performing it can lead to rips ( i learned the hard way)
Sounds like you were unlucky magicdiscoman
This is a great effect - i love the way you can get some of the audience to participate holding the letters spelling things like "Hippy Barthday" etc. If you do buy it - take your time and be sure it's well worn in before performing