I used to play it a fair bit, but (And I will be honest) I'm not a very patient person when it comes to games, so I just got bored with it.
Even so, its still a brilliant app, so I would advice giving it a go
I always go with my instincts. The thing is, if you follow your instincts, even if they are wrong, at least you did what you felt was the right thing to do, and therefore you never regret your decision (IMO)