My bet is it closes somewhere between $35 and $45. The owners pushed back against the bankers at every turn to push for a higher price. If they don't price at the start of the day effectively, the original shareholders lose money to the bankers who set up the IPO like what happened to LinkedIn.
That's a good point I hadn't considered. As it looks at the moment, I'm glad I stuck to arm chair punditory (if that's even a word!) and didn't buy any shares...