I think theres way to much hype for it to go down. Atleast the first few days. If I can get in at a reasonable price I might, and I'd plan on selling it within probably the first 3 days. I would not go long term until it settles out.
Ofcourse we are only looking at other IPOs recently and mastercard. Alot of get lucky (or unlucky) plays into this now, especially with the way the market and economy is currently acting.