$30 is a long way from $50! I can't even fathom a guess. I remember playing Netscape when it came out and was very fortunate to get out alive! It went to $74 immediately, if memory serves. I recall Boston Chicken IPOing at $17, opening at like $25 and running to like $45 I believe before tumbling back down. That one was a goody!
I think it may absolutely SCREAM the first day. It's the first decent IPO to come along in years. And the company is actually profitable. I think it could go as far as $200 the first few days. Then it'll fall back as the flippers take their profits.
May not be significant flipping; institutional investors part of the syndicate won't be allowed to sell immediately.