Logitech G502 Proteus Core gaming mouse review - A versatile flagship

Closer Look

On paper, opening up this rodent should be an easy enough task. There are 4 screws hidden under the slippy pads and 3 more clamps tightening the whole thing together. However, once you take down the screws, you discover the clamps are stubbornly holding everything in place, and only then the real battle starts. Once you get it over with, you are treated to one of the prettiest interior builds modern mice ever.

Logitech G502 Proteus Core - PCB

I'm not joking. The set-up inside this mouse makes it the best rodent I opened up this past year. I might have praised Corsair's interior architecture, but it doesn't JUST hold a candle to this rodent. The PCB layout is nicely done, with some pretty neat soldering. The brain is a 32Bit ARM micro-controller, whilst the heart, MW3366DM-VWQU (Pixart 3366), is an IR-LED optical sensor that gets its own PCB under the main one.

Another thing you might notice is that there are a lot of OMRON switches there. Well, Logitech opted to use OMRON for main-PCB buttons, with left and right click using D2FC-F-FN rated at 20 million clicks, and the rest using the standard version with a lifespan of only 5 million. 

Sniper, Back & Forward buttons use Zippy Microswitches, which Logitech used in some of its cheaper rodents. Whilst the brand doesn't have the OMRON reputation, the micro-switches are still rated at 5 million clicks.

Logitech G502 Proteus Core - Insides

Logitech G502 Proteus Core - Mousewheel

The mousewheel is quite interesting. I have not seen many heavy-metal scroll wheels until now, and once I took the mouse apart, I took a better look at it. It weighs in 16 grams, more than 10% of the mouse's total weight, and it seems to be made entirely out of metal.

However, the switches used behind it are generic ones, so whilst the wheel will endure chaos and destruction, don't expect them to do the same.

I couldn't tell what made it wobbly, but if I were to hazard a guess, I'd say it's the heft behind it. After all, the movement is more distracting when used in free-spinning mode, and almost unnoticeable while notched.

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