I bought the first XDs. Here is my take on them. As far as the 9mm version goes, it is too heavy compared to similar single stack guns. It felt too heavy in my pocket. My Sig P938 and Kahr PM9, for example, are quality guns that are lighter and carry better. Springfield's ad focus on the guns' thinnest but it is like saying that a dime is thinner so it is easier to carry in your pocked than a nickel. A fraction of an inch does not matter plus so many people I know, buy thin guns and then carry them in bulky holsters. At 23 ounces, the XDS 9mm is much heavier than most single stack guns.
In the .45 version, I found the recoil to feel excessive compared to my two 3" .45 acp guns. The reason was that when you have a thin grip, the recoil is concentrated into a smaller area and is then felt more than a gun with a fatter grip. I sold that one too. I also had to focus on holding it tight. If I relaxed my hand a little, I could make it jam. I could not guarantee that I would be able to have a proper very tight grip on the gun under all circumstances. My other guns were much more forgiving.
You are comparing a single stack gun to double stacks. The single stack will always carry better. However, if you compare the XDS to other single stacks, it is much heavier and therefore not easier to carry than my single stack 9mm guns. For the .45 version, it is a nice small size for that caliber but it comes at a price.
I mainly carry single stack 9mm guns. My single stack guns like the Sig P938 and Glock 43, fit nicely into my pocket and are lighter than an XDS. Did you know that the XDS 9mm weighs more than the .45 version, empty? Less metal in the barrel due to the bigger hole, is the reason. the gun frames and triggers are the same.
I do not think that they are bad guns. In fact, they are well made guns for their price point and very good for belt carry. However at 23 ounces, I can belt carry a lot of other guns that are lighter and also carry them in my pocket with ease. As far as the .45, I found it too heavy for pocket carry and too light for a small .45. If I am going to belt carry, I can carry bigger and heavier guns to reduce the recoil. Just my opinion on these two guns. As I said, they are good guns that will work well for most. I just have different preferences in single stack guns just as I favor all metal to polymer.