So if you're looking for a larger mouse, and aren't completely on-board the "ultra-lightweight" train, I definitely think the G403 is a good choice. The G Pro is a smaller mouse that can feel a little awkward to use with the wrong hand size, but we've found that the G403 is agreeable for everyone we asked.

It also has better quality mouse feet, a higher maximum CPI, a more consistent sensor, and a lower minimum lift-off distance.Also, it has a wider CPI range, a more precisely adjustable CPI, a lower lift-off distance, and lower latency. It doesn't have a default button for profile switching, but you can always map it to one of the buttons through G HUB. The Logitech G403 HERO and the Razer DeathAdder Essential are both right-handed wired gaming mice, but the Logitech performs better overall. This update adds a new Sensor Latency test and makes minor changes to several of our existing tests, resulting in test result changes in several sections.

The M4/M5 buttons are minimally an improvement over some older mice, like the G500, where the side buttons would dig into the thumb after long gaming sessions. Although all of its buttons are programmable, but it doesn't have nearly as many side buttons as a dedicated MMO gaming mouse. Neither has the pre-travel spring keeping tension on the switch, and neither has the steel pivot bar for the fulcrum. We've already seen in the G900 -- which uses a similar coating -- that grime and dirt collection on these new mice is at an all-time low. The Logitech has a more flexible cable, smoother-gliding mouse feet, a much wider CPI range, and a lower lift-off distance.Otherwise, assume any technical sensor, accuracy, or button functionality is equal on both the G403 and G Pro.