It mixes very well once it gets started, but I find I have to stir and move the ingredients around. I make a lot of fruit smoothies, and I've tried alternating the order I add the ingredients, but it didn't make any difference. Most recently I tried adding the ice first, then fruit and yogurt on top -- big mistake. For best results, put the ice on top of the fruit and yogurt. But once it starts, it does a great job, no ice chunks!