I have alot of Armani's and Zegna's. When it comes to clothes im not much of a label shopper, but I do have have to admit, after wearing a designer one, its very difficult to wear anything else. They fit well, are made from light comfortable materials, and are stylish. Some of my suits are going on 10 years old now, and still look as good as they did the day I bought them. So its safe to assume they also last longer. I have had others (no names) , but they fell apart after a few wearings.
They are expensive, but like anything else, if you get them on a decent sale, works out to about the same as what you would pay for a "regular" suit.