I have owned four XD's, XD-40 Tactical, XD-40 Service, XD-40 SubCompact and XD-45ACP Tactical. I traded the XD-45ACP to fund a 627. I still have and use the XD-40s. The XD-40 Tactical above is approaching 40K rounds. Lost exact tract back in the twenty-thousands.
The XD-40 Tactical is my USPSA Limited-10 gun and occasion 3-gun/multi-gun handgun. It was bough in 2005 and had the early locking block in it. The locking block cracked. I noticed the block was cracking and kept shooting it anyway. I put another 500+ rounds through it over the next two matches with the cracked block and it never failed to function. Had a weekend off from matches so I sent it in for warranty repair. SA fixed it free in 8-days door to door and even reimbursed me the cost to ship it to them. I had a trigger return spring brake once. Call SA up and they sent me a new one free of change. The only other failure was an aftermarket trigger bar I broke but that was not SA or the XD's fault. I put a very early aftermarket trigger bar in it before the design was proven. I am running a real light 14 lbs recoil spring in it so I am pretty religious about replacing those about ever 4000's rds. That is just enough spring to hold the slide in battery against the striker spring so it does not take much loss in stiffness before out of battery problems will start popping up so I change it out before that can happen.
My XD-40 Service and XD-40 SubCompact both only have 5-10k on them. I have had zero issue with them.