Official reseller of GHK everything. Anyway, I was in dire need of some proper green gas mags, and apparently their gen 2 ones are proving to be pretty competitive (apparently hands-down beating reliability when compared to the ProWin mags, anyway).
So I initially made an order, and, being the idiot I am, I managed to buy 5 of the wrong magazines. Realising my mistake the next morning, I immediately rattled off a PM and has a reply back from Samoon himself after 3 hours saying that they'd cancelled the order and that it had all been refunded.
Anyway, I then went on to re-order 6 of the gen 2 M4 magazines - the order came to $365 shipped (so that's $65 postage - not cheap, but not expensive given the weight of the order).
Dispatch was fast; the package was sent out within 6 hours, and, I'd been told that they'd thrown in a t-shirt and some high viscosity silicone too - the combined value of which would have been ~$15, so it was a nice thought.
It was shipped with EMS and although I initially couldn't get any shipping information to display, a quick e-mail to Samoon revealed there was a 2nd, more reliable tracking website that was well updated and showed every stage of the journey (including the customs process). From the checkout to my door, I'd say it was exactly 6 days (two of those being the weekend) - on something that did require duty payment, I was pretty chuffed. The whole thing was packaged nicely too.
All in all, a big thumbs up from me. I know of people on Gasguns who swear by this website for various GHK replacements (ask Samoon and he'll provide prices for every last bit) and although I was buying for my G&P, I'm pretty content with the knowledge that if something goes wrong, I'll have somewhere to easily buy replacements (something I cannot say so easilly about ProWin or G&P brand mags).