Key travel, elasticity, compact size, everything is on top. Even usb ports came in handy, which I did not know about when buying. I took one to work, I wanted to buy a second one for home, but I did not find free delivery to the pickup points closest to the house. I was greedy and ordered the Logitech K280e Black, which I regret a little, not that it would be much worse, it’s just that the keyboards are different, it’s often not comfortable to switch, so I’ll buy a second A4Tech.