I have used 65daigou's forwarding service from their US for around 5 ~ 6 packages and they have always delivered in the specified time slot to my home address. Furthermore, you can keep costs down by asking to pick it up at one of their outlets.
My sample size is small - I have read that they also have load issues and there are people who experienced losses as well.
The only other freight forwarder I have used before is Borderlinx, which performed admirably but at a higher cost.
I have not used vPost, but to be honest, unless it is direct delivery due to EMS from Japan or other countries, I will not recommend anything that is being touched by Singpost due to poor experience from their fleet of outsourced delivery couriers.