I have owned an XD9 for about 2 years now and probably have just shy of 10 thousand rounds through it. I love this pistol...very nice shooting
I have had one hitch, the locking block is developing a small crack in it, but this is due to stress points in the early design of it...which I have. The issue was fixed...to find out, you will see "rounded-out" corners between the front rails where the guide rod butts up against the locking block. Replaced the stock spring with a 22 # one and that is all I have done.
Overall, I would recommend this pistol as very reliable and of good quality.