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My only experience of buying using GSP was to get a Timbuk2 bag sent over from the US (it was cheaper and in better nick than anything available from within the EU). I think I paid £20 for the bag and about the same for postage and import fees etc.
Considering UK sellers wanted upwards of £40 for worn out bags and closer to £100 for ones in similarly minty condition plus generally around £10 postage it was a no brainer.
The GSP is for buyers who really really want something and aren’t too worried about how much they pay to have it shipped.