I have 3 coffee machines (Dolce Gusto, Senseo, Tassimmo!!) but don't like the plastic milk that comes with them, so always microwave milk, but then I don't get froth.
This simply and cheap item has solved that dilemma.
It came very well packed. Simple instructions are in the box.
You put milk in the glass jug, up to a black line (or less if one cup!), microwave if you want it hot. Then pump up and down. You end up with lovely froth, thick just like Costas. It came with a cork mat to prevent it slipping.
There's a bit of washing up, or you can put it in the dishwasher.
Basically it does what it says! and it makes frothy milk shakes.....!