Hi Em, my mum and I both have one and she can make beautiful yoghurt in hers....she swears by it!!
I on the other hand can never get mine to work
It never sets for me and I follow the instructions down to the letter.
They are definitely worth the money though (mum makes mine for me sometimes!) and at least you know how much sugar is in it!!
Have you ever had the easy yo ice cream??? you don't need the yoghurt maker for it, but it is really yummy too!!!