I got this a little while back, though did pay for it, albeit a tiny amount.
I was hankering for it ages ago after reading a massively positive review when it got released, but never got round to getting it. I've played a little bit but have had a hard time getting it setup to play with a 360 controller. Even then there are a multitude of extra buttons assigned to the keyboard and I need some sort of map to keep tabs on everything.
Some kind of sequel thingy "X4 Foundations" being flogged on gog's email newsletter ATM ("highest discount ever" er, for the as-yet unreleased game). Yeah like I don't have enuf games. :-S