Bought this to replace a basic model I’d been using for 6 plus years. It’s really simple and I make yoghurt as follows, 1L UHT semi-skimmed, 3 teaspoons skimmed milk powder & between 2-5 teaspoons of Yeo-Valley plain yoghurt (for first time or your made yoghurt for subsequent times). Used 2 teaspoons for years with old machine, used 5 on first use with this machine as instructions said 150ml, ignored that it was fine. (that was for more milk though but the UHT comes in 1 litres). Was also fine with 4 teaspoons, so will try next time with 3. Leave it 10 hours, pour away any liquid and left with a smooth creamy yoghurt. I restart mix every 5/6 weeks using YeoValley yoghurt and make every 5 days at latest. Hope this helps. Model doesn’t have an alarm/timer which would be useful but I just set my phone to remind me to turn it off.