Yes, went a couple of years ago with a group of mates.
it was a great event to go to if you're a f1 fan! so close to the track, great atmosphere etc. However its VERY warm!
flew with singapore airlines on an a380 (economy), normally fly first, but I had NO complaints what so ever about singapore airlines economy, loads of space and great food.
my accomodation was sorted out by someone I know that lives in Singapore and I wouldn't reccomend it to anyone to be honest! You will pay a premium for hotels and accomodation when the nightrace is on, so if you're just wanting to go to Singapore and not fussed about the F1, I would reccomend going at a different time.