Sorry, I've got my nose in too many discussions at the moment. I overlooked your Gene Café question. I've found it is very reliable, easy to clean (which is not necessary very frequently), and catches chaff very well. I roast with it sitting on a cooking pan on top of my stove with the overhead fan on full to vent the smoke outside, works like a charm. It is a hybrid air/drum roaster, so the airflow is relatively slow (about 1/10th that of a hair dryer) and the metal plate in the center of the off-axis rotating glass chamber conducts heat to the beans. I've found the roasts are better than what I could get from the hot-air popper I started with, and the Hearthware i-Roast2 I used for a couple years before its heating element burned out.
The Gene Café's settings are very straight forward: target temperature & count-down time. Maybe too simple. As far as I can tell, the rate of heat rise is not adjustable, so sometimes I step it up manually by starting with a cooler setting and then increasing after it reaches and holds that first temp for a bit. And I decrease the temp just after start of first crack to prolong the time before second. I usually stop just at the start of second crack. Many say it is hard to hear the cracks, but for me it is much easier than the i-Roast 2 was. But I bet the Behmor is easier.
When you stop the roast, it goes into a cool-down mode and you cannot remove the beans until the chamber exit air temp reaches 140degF. So I stop it a bit before the beans have reached my target, with the goal of them coasting there during cooldown. But I have also turned off the machine entirely when I stop the roast, quickly empty the beans into a colander for hand cooling, put the chamber back in, restart the roaster and immediately put it in cool-down. This lets the Gene Café cool itself down so it doesn't overheat, while I cool the beans faster manually in the colander by stepping outside and tossing it around a bit. This works very well in the winter. I've tried with fans in the summer, and while it is still better than cooling in the roaster, it's not the same as in the cold winter air. I have plans to make a vacuum cooler, as soon as I find the time.
How do you like your Behmor? When I bought my Gene Café it was less than $400, but their price has gone up significantly. Now the Behmor is much more affordable than the Gene Café, although I've heard that chaff collection is a bit of a concern.