They do claim to have reduced their wireless lag, but smartly don't claim to be as fast as wired. I wonder if their products perform better, when wired. They don't say if you can reconnect the G510 to a wire, either. Essentially, wireless products that can be wired for wired performance would encourage me to buy wireless.
Actually, since with the mouse, they let you get wired, when you want to and to recharge, I'm ok with the wireless.
Wireless that can be wired in general, guarantees I have detachable wires. I would rather buy a CST trackball, but I'd prefer a mamba to my death adder, for example.
The design looks chunky and old school, in a bad way on these products, although, I think the G510 looks a little smoother, than the G15