The AXS Stealth Controller can be assigned to any AXS function. However, if your bike included this controller from the factory, you would need to add another controller to maintain full functionality of your AXS components. The upper button must also be reserved for Push Mode when used on Eagle Powertrain bikes.
Additionally, while it is compatible electronically, this controller isn’t a great fit for use with the RockShox Reverb AXS dropper post as it is designed to mount between the clamp and a mechanical dropper post remote. It requires that a mechanical dropper post remote is installed to hold it in place, as the mounting hole is not threaded.