I was a bit apprehensive about the frother having bought things in the past that didn't work, but was pleasantly surprised.
It comes with two fittings – one for frothing (and it turns ALL the milk to foam) and one for stirring (which produces a small amount of foam too). It can heat as well as froth the milk, so you can get cold foam if you wish. I am exclusively using the stirrer and heat setting, the milk becomes the perfect temperature to melt some Whitakkers chocolate in and you get a little bit of froth on top as well. You get about one cup of hot milk, or enough foam for two lattes.
Highly recommend it, but will note that it will burn the milk a bit if you let the leftovers sit in the container – so it pays to clean it right away. A simple rinse will suffice, the non-stick coating does wonders.