It's well worth checking out too - definitely one of the nicer OW lounges.
Last time I had a same-plane transit in SIN I managed to fit in a drink and a snack at the lounge, a browse through the shops, a duty-free purchase, a 10 minute wait while the DF shop assistant went away to get my free gift (JW Blue crystal glass

), and still got back to the gate with plenty of time to spare.
(My transit was under an hour

).
Cheers,
- Febs.