The Madman is more comfortable to wear compared to Mars. My head is not in the small category, so this is the reason for that. And Mars arms are not very flexible, which is the case with Madman. The Madman is a bit wider and higher as well.
Also, the hinges on these new models are probably similar to the ones on half x. Maybe not the best choice in my opinion. I have a pair where the pin got loose and that pair is not the same.
Not as tight at the original X-Metals, but I always felt those were a little too snug. These feel just right, and despite the smaller lenses, you don't notice. The Badman is even better for all day use.