It guarantees a refund from the G2A company if there is *any* problem with your key (e.g. wrong region or wrong language or - does this even happen? - Mac format when you wanted Windows, etc). I wouldn't have touched G2A when I first heard of them last year, but I've been following them throughout this year, and
they do seem to be quite problem-free and gaining a lot of popularity. I generally buy from places like Amazon, Gamersgate, GOG and Steam - even using Greenman Gaming is a stretch for me! - but G2A seem to be fine. I'm surprised.
I do wonder what the G2A protection does that Paypal protection doesn't - I guess you wouldn't get a Paypal refund if you'd bought an item that was region-locked? So I'd use the extra protection, just to be careful. Well, for $7.23 Watch_Dogs I would!
Edit: I'm sorry guys, I couldn't buy it earlier as I was in work, but I'm buying it now and there's a $0.65 surcharge for using Paypal.
However, discount code RAIST gets you 3% off.
So to buy Watch_Dogs with Paypal, the total is
US$7.66.
I'm going to go above my $7.50 target price for this one.
Just this once. Edit again: or I
would, if they still had any left! /o\ Silly work, stopping me from spending money on games!