As someone who has done A LOT of overseas shipping before, here's my experience with the local freight forwarding services.
Reading other posts describing personal experiences with the 3 services, I can see that everyone has different opinions about each, so maybe this will just confuse those who are new to this, but I hope some will find it useful anyway.
vPost
Used them for a very very long time, like since they first showed up years ago. Probably done about 30+ shipments (not packages) total with them, each usually at least 5 packages, sometimes over 10.
Especially before Amazon offered free global shipping, I used them like almost every other month.
Contrary to a lot of users here, in ALL my many shipments with them, they have not lost a single package. Not one at all. Across over 30 shipments, that's about 200+ packages.
Maybe it's just my neighbourhood post office workers were more competent or something, or I've been lucky all this while, but I've never had a single problem with lost packages with vPost.
I actually find the fact they're under SingPost quite convenient cause the post office is nearby and I'm usually not home when they deliver at office hours, so I can always collect the next day. Even moreso now with their locker service, can just collect after office hours.
The one and only bad experience I had in all my years using vPost was when they once miscalculated a package's dimensions and I ended up paying a lot more for shipping of that small package, and when I went back to them with the error after receiving the package, I had to jump through a lot of hoops just to get a refund back, cause the aunties at the post office front desk had no idea how to handle such a case.
Last time I would say one general negative of vPost was the time it took to process packages and enter them into the system for you to identify, especially years ago when it was all manual e-mailing of invoices, but these days that's less an issue since they have a new interface which is pretty easy to use. (Just select goods type and enter value, done.)
Shipping from the time you consolidate and check out your packages is usually around 1½-2 weeks, and they almost always have 10% promo codes with whatever card you use to pay.
comGateway
Tried their concierge service once cause I heard they had good rates, but they messed up a single order BIG TIME and even blamed me for the problem initially, until I showed them definitive proof (which I got off my account on their site, so they were either in denial or too lazy to get it themselves) that the error was on their end, so I never went back.
Even lost a bit on the cost of shipping the item here cause I insisted I did not want to keep the one they wrongly ordered for me, and they agreed to ship it back at their cost but I would only get refund for the initial cost of the item, not the shipping cost.
Either way, I never managed to get the item I had originally wanted them to order cause it sold out after they missed the boat with their cock up.
No apology, no compensation, no nothing. Terrible customer service, will never consider them again.
Borderlinx
Actually giving them a shot now, cause their free repackaging service sounds useful (had to pay a lot of useless "volumetric shipping" fees with vPost), and they offer a longer holding period to consolidate multiple orders (1 month as opposed to vPost's 3 weeks) so will report back with how it goes soon.
One minor drawback I've noticed so far is that their forwarding address is in Ohio, and some of the sites I shop on charge taxes to that state, whereas vPost's address is in Oregon and avoided those, so that might be something to take note of.