I was one of the first customers to get an SLX shipped and the first to register one on Finalmouse's XPANEL — if you missed that story, I wrote it up with the full video here, also watchable directly on YouTube. This is the actual review now that I've had real time with the mouse.
Build & Buttons
The unit itself is solid — no QC issues, and it looks great. Buttons feel crisp. Whatever complaints I have below are specifically about the TMR-DS switch tuning, not the build quality of the mouse itself.
Shape
It feels like it sits somewhere between a Superlight and a Viper V4 Pro — leaning more toward the Viper V4 side. Between the two, I actually prefer the Viper V4's shape: it slopes harder in the back, which makes claw and fingertip microadjustments easier. That said, I like the SLX shape more than Logitech's Superlight or Superstrike shapes. It just doesn't beat the low-profile feel of Finalmouse's own ULX line, which I still prefer over this.
TMR-DS Switches
This is the section that matters most. TMR-DS is Finalmouse's answer to Logitech's HITS — and right now, I'm severely underwhelmed by it. The right click is noticeably more sensitive than the left, which shouldn't be happening on switches that are supposed to be identical. There's also no difference in physical click activation feel, which is a genuinely bizarre sensation once you notice it — it makes the switch feel defective even if it technically isn't.
What HITS gets right that TMR-DS doesn't yet: HITS lets you actually feel a difference in when you get feedback on the click, tied to the actuation point. TMR-DS doesn't deliver that same distinction. As of right now, nobody has a real answer to Logitech's HITS — TMR-DS included.
Finalmouse pushed a firmware update today, and it's still very quirky even after that. You can turn TMR off entirely in XPANEL and just run the SLX on a standard click instead, and honestly, I'd much rather do that than run TMR-DS as currently tuned.
Pros
- Crisp buttons, solid build, no QC issues out of the box
- Shape I prefer over the Superlight and Superstrike lines
- TMR can be toggled off in XPANEL for standard click behavior if TMR-DS isn't for you
- Looks great
Cons
- TMR-DS switches feel inconsistent — right click more sensitive than left
- No felt difference in physical click activation, which feels defective
- Firmware update didn't fully resolve the quirks
- Shape still trails the Viper V4 Pro and Finalmouse's own ULX line for me
Verdict
Genuinely a good mouse held back by one specific setting. The shell, buttons, and shape are all things I like more than I expected — I just wish I'd left TMR off from the start instead of running TMR-DS. If Finalmouse tunes this further, this easily climbs higher. As it stands: 8.8.
Frequently Asked Questions
What are TMR-DS switches on the Finalmouse SLX?
TMR Dual-State is Finalmouse's analog switch system, using tunneling magnetoresistance sensing to enable rapid trigger and adjustable actuation — Finalmouse's answer to Logitech's HITS switches.
Are the TMR-DS switches on the SLX good?
This review found them severely underwhelming — the right click is noticeably more sensitive than the left, and there's no felt difference in physical click activation, which feels bizarre and makes the switch seem defective. A firmware update did not fully resolve the quirks.
Can you turn off TMR-DS on the Finalmouse SLX?
Yes — TMR can be toggled off in Finalmouse's XPANEL software, which makes the switch behave like a standard click instead of the analog TMR-DS behavior. This review's take is that leaving TMR off is the preferred setting as currently tuned.
How does the Finalmouse SLX shape compare to the Superlight and Superstrike lines?
The SLX shape is preferred over both the Superlight and Superstrike shapes in this review, but it still ranks below the Razer Viper V4 Pro and below Finalmouse's own ULX low-profile shapes.
Specs reflect official Finalmouse listings at the time of writing — verify current pricing and availability before purchasing. Impressions above are a direct personal take rather than a lab-style average.