They deserve 0 stars... Stay away... lousy Customer service, and will play with your money, particularly larger amounts. Took my money, asked for documentation but didn't make the transfer. I then asked them to refund the money but they refused. They benefited by the rates moving up the next day or so, i lost more than SGD 2000 by them not refunding.
I then found SingX which offers far better exchange rate as well as better service. Will NEVER GO BACK to Instarem!