I used Grab when I was in Singapore recently. Worked well for me. I have the Flexiroam SIM overlay so had service right away. If you're going to several places it is a very useful service and saves the trouble of having the get a new SIM in every destination.

I used the Grab premium car service several times since it was only a couple of bucks more than regular Grab. From the airport I have a super luxe Toyota minivan which was quite nice.