The extra long combos I have are the first generation post Bonney Matco wrenches. I don't have a full set of those, though. I would love a set of Cornwell or Mac extra longs, though. Both are very nice. I wish Wright would come out with extra long combos. I have been asking them for years, but they keep telling me maybe in the future.
The Craftsman Pro wrenches aren't bad. They do spread more when you really put out on the open end compared to my Bonney, Matco, Mac, or SO wrenches. It's not bad, but you can tell a difference when you have to break things loose with the open end. I've never noticed a real difference with the box end. They are good for general use, though.