Left and right click buttons fail mechanically within 1–2 years of normal use, with one confirmed case of left-click dying due to switch wear.

“Logitech MX Master 3S right click randomly stops working — £80 mouse — less than a year old.”

vs Marketing: Logitech markets 'a high performance experience with zero distraction' and 'the best made better,' but hardware button failures within the warranty window are a fundamental performance breakdown, not a distraction-free experience.

Multiple owners describe the MX Master 3S as a disappointing, overhyped product with numerous flaws that do not justify its premium price.

“Overall, this mouse feels like a poorly marketed product with numerous flaws, leaving me disappointed not only in my purchase but also in Logitech as a company.”

vs Marketing: Logitech claims 'productivity just clicks with this amazing mouse' and 'the best made better,' but 4 community posts with owner_ratio 0.75 describe it as 'hot garbage,' a 'disappointment,' and something they 'cannot endorse.'

The soft-touch surface finish degrades visibly within one year of use, with staining and wear reported by owners.

“One aspect I can't stand is the soft-touch finish; it deteriorates far too quickly. I previously had an MX 3 from my last job, and it was so worn that I decided to buy the MX 3S for myself.”

vs Marketing: No explicit marketing claim covers coating longevity, but premium pricing and 'the best made better' positioning set an expectation of material quality that the coating does not meet.

While most users welcome quieter clicks, a subset of users find the new tactile feel 'mushy' and inferior to the classic MX Master click.

“I hate this new mushy sound of 3S, I like the classic sound of a satisfying click.”

vs Marketing: Logitech claims Quiet Clicks offer 'the same satisfying feel but with 90% less click noise,' but at least 1 in 3 click-noise mentions explicitly disputes that the feel is preserved, calling it mushy rather than satisfying.

Ergonomic comfort is not universal — users with smaller hands or atypical grip styles report initial or ongoing discomfort, and the mouse is explicitly unsuitable for left-handed users.

“I recently purchased the MX Master 3s mouse, and I initially experienced some discomfort with its ergonomics.”

vs Marketing: Logitech claims the 'ergonomic design comfortably fits the hand and reduces wrist fatigue during extended use,' but 2 community data points and a TechRadar review note it may be uncomfortable for smaller hands and is not designed for left-handed users at all.