I've been using a G402 since 2014, but this year I decided to finally upgrade to wireless after dealing with cable drag for far too long. Note that this mouse is identical to the G403 save for the wireless connectivity.
I'm very impressed with the build quality and ergonomics of this mouse, thought it is a bit shorter (front to back) than I would like. The shape is very similar to that of the G402, with a slightly higher ridge in the palm arch area and concave buttons instead of concave ones. if the G402 is comfortable to you, you'll likely find this mouse comfortable as well. The weight distribution is a bit different on the G703, with most of the weight focused at the back of the mouse near the optional added weight.
One major difference between the G402 and the G703 is two fewer side buttons. Personally this is sort of a let-down, as 4 buttons and a dpi-shift button was a good balance for me. However, the two side buttons (down from 5) and one extra top button (dpi-shift) are much higher quality than the extra buttons on the G402, without the G402's sharp edges. Also notable is the lack of glossy black anywhere on the G703, when it was very prevalent in the G402's angular design. This is a pro for me, as that material collected fingerprints like mad, and the frequent divets in the G402 collected dog hair as well. The G703 is far smoother than the G402 but has some missing buttons that may be important to certain users.
Let's talk about wireless. Wireless mice are tricky for gaming, and Logitech has the best wireless implementation that I've ever used. That being said, the input lag *is* noticeable, but definitely not unbearable. I don't play a lot of competitive games, so I may not have the finest-tuned eye for this sort of thing, but I got used to the feel of this mouse after about an hour of gaming with it, and I can really only detect the slight input lag (think 6ms instead of 1ms) when I'm actively looking for it.
The battery life is good, but not exceptional. With the high polling rates, sensor quality, and absolutely necessary RGB lighting found on gaming mice, it's natural that the battery life would be lower than other Logitech wireless mice such as the Performance MX or MX Master. The battery lasts around 25 hours as claimed with the lighting on and in heavy use. Most people could probably go a week or so easily without charging, but I would plug it in to charge overnight at least every few days just to be on the safe side. One nice addition on the software side would be a tray indicator for the mouse's battery life, but I guess "the technology isn't there yet." (This whole paragraph is somewhat moot if you have a Powerplay, which I don't).
I can't speak to the durability as I haven't had the mouse this long, but I've had a great experience with Logitech's customer service in the past with the 2-year warranty included with their product. I would recommend this mouse to anyone outside of the most hardcore latency-snobs with its comfortable design, pleasing aesthetics, and excellent wireless.
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Carbon Neutral Certified by SCS Global Services
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