The accepted standard barrel length for compact/officer 1911 is 3.5", so the ECO is no different in length than any other compact/officer 1911 in that regard.
I have owned one and what you get is a superbly refined 1911 with just about every bull and whistle and all the fancy extras that are on high end models. It will make a Colt look like a Rock Island in terms of build quality, fit, and finish. If you like excess then you will love the ECO.
What I simply couldn't come to terms with is the price you pay for a gun that small that you are likely going to carry. It just seemed excessively expensive for a carry gun and really too small to do much else well. But aside from those things, I am a big Dan Wesson fan and own several Dan Wesson pistols myself.