Here's my thoughts after gshipexpress, borderlinx, comgateway. Not vpost, but Ill add in what I think.
Borderlinx: crap service, I nearly threw up chatting with the CSO online. They take TOO LONG replying every bloody question you ask.. 5-10 minutes. And I never got followed up on, ever. Fees exorbitant despite boasting to be cheap. I really encourage people to stay away from this one. You still have to pay us$10 flat rate to have your parcel insured which is ridiculous. S$79 to ship 3 apparels to singapore? Oh my lord.
CSO via phonecall is nice, like I can actually hear them nice and clear! But they told me they had some "system error" and promised to call me back in 15mins. Never did.. they did email me, but I have since waited over 12hours for their reply. Sigh.
Vpost: havent tried, but too many horror stories. I think they are the cheapest in the market advertised, but would not try. Too scared.
Gshipexpress: only tried once, and its not as cheap as I hoped. Still slightly cheaper than comgateway, but the timeframe was too long - i.e. shipper tells me item shipped but gshipexpress dont update me for days, up to 5 working days even, I recalled. But I did get my item eventually. I cant remember if they engaged DHL.
Comgateway: my favorite, no issues so far. Some people complain expensive. I also used to think so.. till I tried borderlinx.. oh my goodness. LOL.
Items turnaround is quick, I chatted with CSO and gets my issues resolved quickly. They use DHL which I also havent had problems with. Shipping time is quick. Just that they not generous with discount codes.
But heck, after I tried borderlinx I seriously appreciated CGW more.