Let me preface this by saying that i've never had an issue with GG, all my packs have landed to Eastern US no problem and very quickly at that.
The thing is on GGs store you only have 1 month to leave a review from marked as sent, so if you have a late arrival and want to leave positive feedback when your pack lands, or have to wait for a reship and it doesn't arrive at all then you won't be able to leave a review either way.
i don't get the idea of having feedback on a vendors store..
it is just one vendor he can pad the fuck out of it whenever he wants
i bet there are no bad feedbacks on the vendor store