I just got an xps2 and I love it. If it goes down it doesn't interfere with the use of iron sights. The xps3 is only better if your going to use night vision. With both these models the buttons are on the back but if you check out the exps2 and exps3 its the same thing just with the buttons on the side. That to me might be worth a little extra cash if your going to use night vision or a magnifier
