Great gun! I just picked one up myself from a guy. I got mine for 200 with the original papers and three mags.
However it is a little beat up and worn, but who cares its a XD.. its fine. I put some TLC into it and cleaned it really well. It shoots as good as new now. It did not have many rounds through it, just was not taken care of well and was a holster gun. I have since fully stripped it though and cleaned it back up. This gun is amazing. Its a close fight with my Glock 19, however I like the trigger on the glock better.
I do really like the option with the extended magazine though. The best upgrade i put on is a set of tru glo sights, they are great!
Enjoy your xd, you got a great deal for such a great looking pistol.