I used an almost identical flame annealer made by Annealeez (which Burstfire seems to have copied) when I was brand new to the concept of annealing.
It was okay if I was just using one cartridge, but it was a royal pain in the butt when it came to switching up cartridges, especially when going from something small like 5.56 to 300 RUM. Getting the angle, amount and duration of the flame just right is a PITA. You will destroy a lot of brass.
I eventually came to realize that it was impossible to recreate exactly the same annealing results batch-to-batch of reloads.
So, frustrated, I sold it and bought an AMP Mark II Annealer with an AMP Mate.
https://www.ampannealing.com/Yep. It costs more, but it's absolute perfection every single time.