I've made yogurt 5 times already and love this yogurt maker!  I can stir up the mix...not heating...set it and forget it.  The only thing that wasn't clear before I got it is the need to have the yogurt cool in the machine for 12 hours.  So... I simply begin the yogurt sometime in the morning (9 hours) and let it sit in the machine cooling overnight.  I also strain my yogurt, so that means another few hours...but worth it.  The yogurt is smooth and creamy.