I think such a machine would be a rad way to brute force empathy for the other gender, but I wouldn't go in unless there was a way to change back. I think such a machine would be a cool novelty to use maybe once or twice, but a permanent change would cause me great duress.

Then again, I explicitly identify as a genderqueer femboy, so idk if cis men would even try it as a lark. They may be too afraid of empathizing with others.