They might be lighter, but I consider not having a cord in between the heavy transformer and the wall plug to be a design flaw. Unless you have receptacles with vicegrip like prongs, like they are when they brand new, the transformers tend to unplug themselves over time due to their weight and gravity.

Edit: Oh, and whatever they put in that white rubber seems to really attract cats. Not sure what it is, but it's the only cables in my house that the cats like to chew on. Friends/family have experienced the same.