Do bear in mind that SQ has a horrible habit of scrutinizing tickets at check in , especially in Singapore. They might check to see if the proper fare has been paid and that you *might* be asked to pay the fare diff.
I am not saying that they will do this especially since its their flagship flight.. however based on past and from what I have heard, SQ has refused flight to people who hold below-the-actual-value tickets and even tickets that were issued before there was a fare increase (these were coach tickets), and were asking passengers to pay the difference there and then or else they can always just "get a refund from where they bought their tickets from "!
But good for you that your tickets have been issued...! Do give us a very detailed trip report... and do take the time and have a wander round the back to see how economy class is!