As a kiwi living in Singapore, I definitely would and am hoping to start looking for one next week now that I have convinced DH it's a good idea

I will have her there during labour/birth and for one or two visits post-partum as well.
Using a doula seems common over here, amongst expats at least, possibly because it's harder to have family nearby when you're living so far away. Also, all maternity care here is through an obstetrician so I want someone, other than DH, who will be with me right through the experience.
I'm also really keen on trying hypnobirthing and the group of doulas that I'm considering using can do this as well, so I would do the classes at their centre.