As others have mentioned, the iRoast is loud. After a while though I found I was able to tune in a hear both 1st and 2nd cracks. Apart from the small quantity limitation, and an immediate return on my first machine, I found that it works well. After about 13 months, my machine now stops half way through a roast for no reason. If you buy this expecting it to work for less than 20 months - you wont be disappointed - otherwise, not built to last.