I found using the popcorn machine for roasting took too much attention, but here in the UK I had to adjust for external temperatures and resorted to putting the machine in a large cardboard box during winter to get the temperature high enough (re-cycling the hot air) which of course is a bit of a fire risk. Also, you can only roast quite small amounts at a time (e.g. 100g) whereas my Behmor can happily handle 150g, but doesn't need constant watching.

Edit: Just realised you're likely using a stove-top popcorn maker which I've never tried. I used an electric hot-air popcorn maker which has the advantage of blowing the beans around so they roast evenly and also blowing the chaff out of the top/side chute (outdoor usage recommended).