many reviewers are saying they are as good as the wired ones, so im guessing there are almost 0 delay.
Having a wireless mouse also means i no longer need the mouse bungee, which is a bonus point for me
i have the wired so idk , way to small for my hands. too low, and the sides like cave in witch makes it hard to hold straight and no room for ring or pinky finger but thats just me. sensor doess seem to be nice tho