Seed Sprout Containers..anyone used them?

I like growing Mustard, cress, bean sprouts etc. But they can take up quite a bit of window sill space in the kitchen and are in different margarine tubs and jam jars....

Have been looking at the different modules available and just wondered it anyone has used them and are they worth the price?:confused:

 

I wash out and use the light plastic moulded dishes that the supermarkets sell meat in. Find the a good size for mustard and cress.