Ridiculously consistent in a good way. Started this afternoon's roast session with three batches of my D'Spro Espresso blend, this one's a pre-roast blend. My USRC automated profile target 17min. (Automatically ends and dumps by bean mass temp, unless I override and go manual of course.) First batch 17:05, second batch 17:05, third batch way off 17:08:-) Going on 2 years with this little puppy and still love and impressed by it...