The Logitech G603 LIGHTSPEED is a great wireless gaming mouse in Logitech's G Series lineup. It offers what most gamers are looking for, such as low click latency, a high polling rate, a wide CPI range, and minimal CPI error. You can also adjust the CPI in increments of 50 and it has a really low lift-off distance. Sadly, it's on the heavy side for FPS or ultra-light gaming, and for MMO gamers, it only has two side buttons. It's a well-built and very comfortable mouse with a right-handed slant. It's ideal for any hand size with a palm grip, and it works for larger hands with a fingertip or claw grip.
The Logitech G603 is impressive for office use. It's a very comfortable wireless mouse that can connect to your computer either through its proprietary receiver or through Bluetooth. It's very well made and there are a few buttons you can reprogram. Sadly, its scroll wheel doesn't offer many extra features like left/right buttons or horizontal scrolling.
Okay for FPS games. The Logitech G603 is heavy, so it's a bit more difficult to move around for quick actions. Still, it has low click latency, a high polling rate, a wide CPI range, and minimal CPI error. It's very comfortable and it feels well-built too. You can also reprogram every button through the G HUB software.
The Logitech G603 is great for MMO gaming. You can reprogram every button on the mouse, but it only has two side buttons. It has low click latency, a wide CPI range, and minimum CPI error. It's very comfortable and it has an excellent build quality.
The Logitech G603 is a heavy mouse that isn't designed for ultra-light gaming and it's a heavy mouse. You can't optimize its weight either.
The Logitech G603 is impressive for travel. It's a wireless mouse that's easy to carry around and there's a compartment to store the USB receiver. It feels very well-built, so you shouldn't have to worry about breaking it by tossing it into a bag. It's a very comfortable mouse and it's fully compatible with both Windows and macOS.
The Logitech G603 has a simple, yet elegant, design that fits into any gaming or office environment. The gray top and black sides give the mouse a nice two-tone contrast, and the glossy programmable side buttons look good. It looks a bit like the Logitech G403 Wireless Gaming Mouse, except the top panel is all one piece and there aren't any seams where the left and right buttons are. Sadly, there's no RGB lighting.
The Logitech G603 LIGHTSPEED wireless gaming mouse has good portability because of its wireless design, and there's a compartment to store the proprietary USB receiver.
This is a heavy mouse and you can't remove or add any weight.
Excellent build quality. The all-plastic body and the scroll wheel are both solid, but there's a slight rattle inside when you shake the mouse. The buttons are clicky and satisfying, and even though it doesn't have rubber grips, the sides don't feel slippery. The feet feel nice and allow you to move the mouse around smoothly.
This mouse is very comfortable. It's designed for right-handed people because it has a slight slant to the right. It shouldn't cause any fatigue during long periods of use. Also, the side buttons are well-placed so that you won't accidentally press them, but they're not hard to reach. It's also easy to differentiate between them.
The Logitech G603 is designed for a palm grip and it's easy to reach all the buttons regardless of hand size.
Well-designed for a claw grip. The back of the mouse has a high profile, so it may be hard to reach the scroll wheel for those with small hands.
This mouse is suitable for a fingertip grip only for those with large hands. People with small or medium-sized hands may have difficulty reaching the buttons.
Unlike the similar Logitech G403 Wireless Gaming Mouse, the Logitech G603 can connect either through its proprietary receiver or through Bluetooth. It uses disposable batteries, so you won't have to worry about regularly charging it. Logitech advertises a minimum battery life of 500 hours and a maximum life of 18 months, but this isn't something we test.
You can reprogram every button on this mouse through the G HUB software. You can set a button for profile switching, but you need G HUB downloaded on the computer to do so because the mouse has on-board memory for one profile, and it takes the extra profiles directly from the software.
The Logitech G603 has an incremented mouse wheel, but it doesn't offer infinite scrolling.
The Logitech G603 has the same low click latency whether it's connected to its proprietary receiver or through Bluetooth, which is great.
The Logitech G HUB offers remarkable customization options. It's available on both macOS and Windows and you can reprogram any button. The mouse has on-board memory, but it only stores one profile at a time.
The Logitech G603 is a good gaming mouse with a remarkable sensor. It's very similar to the Logitech G703 LIGHTSPEED Wireless Gaming Mouse with HERO Sensor, except it doesn't have RGB lighting and a built-in battery. It's better-built and more comfortable than some other Logitech mice, such as the Logitech G305 LIGHTSPEED. Unlike the Logitech G602, it doesn't have many side buttons, so it's not ideal for MMO gamers. Also see our recommendations for the best mice, the best Logitech mice, and the best wireless mice.
The Logitech G703 LIGHTSPEED Wireless Gaming Mouse with HERO Sensor is slightly better than the Logitech G603 LIGHTSPEED. Both mice have the same shape and the G703 has RGB lighting. It has a slightly wider CPI range, a rechargeable battery, and it has RGB lighting. However, the G603 has Bluetooth support and it's more portable because it has a compartment to place the USB receiver.
The Logitech G603 LIGHTSPEED is better than the Logitech G305 LIGHTSPEED. The G603 is better-built and it's better-suited for any sized hand with a palm grip. It has less CPI error and it has Bluetooth support. However, the G305 is lighter and it has a slightly lower click latency.
The Logitech G604 LIGHTSPEED is much better than the Logitech G603 LIGHTSPEED. The G604 is more comfortable, it has lower click latency through its receiver, it has a wider CPI range, and there are many more side buttons. However, the G603 is better-built and it's smaller, making it easier to carry around.