They have 6 outlets in Singapore; you can find details of their outlets in their website’s FAQ.
I managed to hunt down another cake shop that sells durian cake. Only thing is that they deliver if you make purchases above S$100!
I’ve not tried their cakes but I find the prices pretty reasonable. Can’t find a review on their cakes either. 😛
So guess you’ll have to try it yourself or wait for me to write my review. 😀