So far so good. The first batch I made had coffee grinds that weren't coarse enough. After 24 hours, it still tasted good, but I had to pour gently to need the sediment at the bottom. The second batch I had a course grind of French toast coffee. I let it sit at room temperature for 12 hours, then refrigerated for 12. Turned out perfect. I may start with warm water next time or let it sit even longer. I tried the same thing with a French press before, but it had way too much acidity.