I wouldn't buy this machine again just for the reason of the long cool down time before you can roast again.
Positive Product Points
It does a good roast when you figure out what temps to set and when to use the fan.
Negative Product Points
It takes too long to cool down to do another roast. I usually end up using my air compressor to speed down the cooling. I blow out the machine every couple of roasts to completely clear the machine of chaff.
Ok machine, a bit pricy. I have roasted many types of beans with this machine with good results. I have the digital model. It takes a while to figure out where to set the temps at different points of the heating process. Also when to use the fan. You have to measure the beans exactly every time if you want consistant roasting. It is a quiet running so you can hear the first and second crack with no problem. I also use my air compressor to blow out the machine as all the chaff does not end up in the chaffing tray. There could be a better handle on the chaff tray as it is a bit hot to handle. After a roast and you are cooling down to 163deg F the door closes and it seems like the heaters take too long to start reheating.