So far the only difference seems to be that it's wireless.
I really liked the build of the ems topgun II, feels really sturdy and heavy, and it was slide recoil. Seriously though, they made this look even more like a real gun.
The sensors also look the same, and are required to be in the same position. I'm skeptical, I'm not sure why they wouldn't just add more sensors on the bar to increase accuracy.