The KitchenAid Milk Frother attachment is an excellent addition that provides great quality steamed or hot milk to make your own latte or cappuccino. It works quickly and safely.  You can adjust the pressure level to get the right strength/level of froth that you are looking for.  I like that you can remove the milk container and put it in the fridge to keep for another time, or just place the tube directly into a milk carton.  
This is a much needed add-on if you like steamed or frothed milk. It looks great and is compact enough to not add much more space needed.