I think it goes without saying that the SB2209/SB2240 is one of if not the best upgrades you can install on your stealthburner. It is so versatile, well-designed and implemented that it feels like it was meant for it. Wiring and installation is so much easier and maintenance is much better when you have an independent toolhead board that can be isolated for testing and modifications if need be. Worth every penny in my opinion.