In IDPA the XD is considered to be a single action as the adminstrators state the striker is fully cocked. I myself find the trigger to be better than a Glock, but many people disagree. In USPSA it is considered as Production. I don't know if I really answered your question, but if you like the trigger enjoy shooting it.
I would consider it an SA trigger, but with several safeties in parallel. By definition the trigger is an SA, but if that means short, light and crisp, then you are misled. It has a fair amount of takeup, some creep and a bit of overtravel. It is like the Glock trigger, but I believe the feel is better.