It's hard to say. There is a bit of strategy to it but like ThravRande has mentioned, it's available for free on the internet. It's not exactly an original concept. You might want to try that first before you plunk down money on it.
It's a time killer for me. I played for a while but way too casual for me since it feels repetitive to me. Just shoot the birds and hope they can break the pig barriers.
I hear so many people talking about this game... and playing it. I need to find the youtube link... there is a metal guitarist that figured out Nyan Cat AANNDD Angry Birds theme songs on Guitar :lol