The order I placed Sunday evening arrived this afternoon by Fedex. The packaging was very pretty. Returns are super easy - the same procedure as Zara.
I ordered this blazer in size 8 (which is medium for them, like Zara).
http://www.massimodutti.com/we.....644925/NAV
It seemed well made for the price, although I'm not sure I'm the best judge of quality. The cut was good but a bit too straight through the waist for my taste. I returned it because the fabric was way heavier than I expected - definitely a winter blazer for my climate.
I also ordered a bunch of white and cream tops, all in medium. This is the right size for me - generous, but I'm pretty sure small would've been too small. Most of their silk tops claim to be machine washable. All the tops I ordered fit well and would have been contenders if they hadn't been too sheer to wear without a cami underneath (at least for work). Either I am a prude or the world is full of overly sheer white tops, because this happens to me all the time.
I'm keeping only one:
http://www.massimodutti.com/we.....466508/SLE
It's perfectly Italian Preppy.
Summary: I will definitely try MD again. I like the aesthetic, and the stuff I ordered looked as good as I expected (based on the price point and online pics) or better. I would definitely recommend trying them.
One caveat. The size range is 2-12 (14 for some things), and you will probably need to size up at least once, likely twice, from your US mall store size.