I see a reason. 2 actually. - poppable side with different button alignment (I always hated the alignment of the logitech ones, at least the one of the 2) - better ergonomic design than other razer mice. Downsides are, though: - only 7 buttons compared to 8 (I wonder why Logitech nor Microsoft never use the unused small finger for a button) - the 2 upper buttons are prolly hard to reach. They are horrible on the logitech ones aswell. I would definatly go for one if I needed a new one right now.