This upgrade will take the micro B’s top speed from ~13mph to 20+! It’s probably not something you need if you’re running the car indoors, but even if you don’t need a higher top speed, there are advantages to this system over the stock one. The Furitek app lets you calibrate the throttle, adjust voltages, adjust how the car reacts when you throttle in reverse (brake or reverse), and more! This makes fine tuning your set up super easy and fun. Unless you run your car in a “no modifications” class, there’s really no reason not to upgrade. I give this product a 9/10, I’m deducting one point because you need to modify the chassis to get the stock body to fit snugly. I removed the stock battery latch and esc mount and use some double sided tape to mount the battery and wires and the body fits like it did when it was stock.