I had a SOCOM when they first came out. I wasnt very impressed with it, and eventually sold it off.
Ive had M1A's in all three configurations. Of the three, I still prefer the original, standard rifle.
Even though the SOCOM is shorter, it still weighs basically the same as the full sized gun. Losing a few inches of barrel doesnt take much weight off.
The sights the gun comes with pretty much limit you to 100 yards or less for any kind of precision shooting. Beyond that, they are just to big/crude. On the plus side, you can replace them with a set of standard iron sights made for the Scouts. A scope or red dot will get you out farther, and of the three, I preferred the red dot, and specifically, an Aimpoint.
The rail on my gun was not a Picatinny/mil spec rail, and my mil spec mounts either did not fit properly, or not at all. Weaver type rings did work. The rail is also made of steel, and gets very hot, real quick, and stays hot for a long time. Springfield swore to me on the phone the mount was mil spec, but then again, they also swore to me the stock wasnt a badly done over GI, which it obviously was. The stock was another of my complaints.
The SOCOM's brake works, but it also annoys anyone around you when you shoot it. Ive heard some complain it was loud to shoot with, but I never noticed it while shooting, but people around did let me know. Another thing is, the whole front end is SOCOM specific, and the gas system parts are not interchangeable with the other guns.
My SOCOM was very "tight", and would not come apart without using a small screw driver. Not a real big deal, but they should come apart for cleaning without tools. Overall, the fit and finish of the gun was not as nice as the other, older Springfields Ive owned.