This machine takes all the guess work out making your own yogurt.  The instruction booklet is clear and concise. It is basically 4 cups of milk and starter.  You can set the cook time and once the cook time is finished, the machine switches to "cool" and holds the yogurt until you attend to it.  No waking up in the middle of the night to move the yogurt into the fridge. To make geek yogurt, you simply strain the yogurt through a sieve to separate the whey out.  I have made several batches, including some with A2 milk for a lactose intolerant friend.  She is happily eating yogurt again for the first time in ages. The machine takes up limited counter space and is fairly quiet.  Well worth the price.