The Shield is NOT more compact. It is only a little thinner (and more or less so depending on the backstrap used in the Subcompact) and a little shorter length-wise (too short in my opinion). It is not as short in the grip. I owned a M&P40c before my Subcompact, and I've owned two Shields. Without a doubt the Subcompact fills the hand and shoots better (e.g. handling recoil) and is just as concealable OWB which is why I have the pistol (as the shorter grip makes up for the thicker slide IMHO). It also has an accessory rail and takes full-size magazines, something the Shield cannot do. This makes the pistol extremely versatile. It can have a full-size grip (17+1), compact grip (15+1) or the 12+1 pinky extension or flush configuration (I have all the above). It also has 1/2 inch more barrel length (3.6" vs. 3.1") to maximize velocity/energy. This can make a difference for expansion (though far from a deal breaker). The width is also not that different, but different enough that, along with the extra weight, the Subcompact distributes force from recoil better (with an increase in grip surface area). The grip is also adjustable on the Subcompact and it has an ambidextrous slide stop (something the Shield Plus also does not have). Lastly, if you like aggressive grip texture, it is FAR superior on the Subcompact. The Shield M2.0 has superior grip texturing to the Plus in my opinion, but the Subcompact has the same awesome aggressive grip texture as the full-size and compact M&P M2.0 pistols. For all these reasons I don't believe the Subcompact will be obsolete. Yes, the Shield and Shield Plus are great pistols in their own right, but so is the Subcompact, and it is capable of shooting better and doing more than either the Shield or the Shield Plus in my opinion.