Sensor

The ME1 uses a well-known top-tier optical sensor—the PixArt PMW3360. It's a true flagship with extremely raw and responsive tracking, a huge amount of perfect control speed, and no unwanted acceleration. It's prone to some smoothing above 2,000 CPI that results in a small amount of input lag though, so it's best used at below 2000 CPI. For the first time in my reviews, I ask you to please take some of these results with a healthy amount of skepticism. My copy is clearly faulty as it has a huge amount of CPI divergence and an unstable polling rate, while other reviewers I trust have not reported such errors.

The maximum nominal tracking speed and acceleration values are 250 IPS and 50 G. You can set the resolution from 100 to 12,000 in increments of 100. The available polling rates are 125, 250, 500, and 1000, which translates into respective nominal response times of 8 ms, 4 ms, 2 ms, and 1 ms. The lift-off distance can be varied in the software: the default value is about 2 mm (it tracks from a DVD in height, but doesn't from two).

Paint Test

There is no jitter on the reasonable CPI steps, or unwanted angle snapping and measurable (or audible) sensor lens rattle.

CPI Divergence

My product has some serious CPI divergence, but other users and reviewers didn't detect anything of the sort. On the graphs above, I've used the CPI divergence values from PRO Devices' (PRO ДЕВАЙСЫ) YouTube review.

Perfect Control Speed

As for perfect control speed, it's very high; the nominal value is 250 IPS, which equals over 6.3 m/s. There is absolutely no chance of hitting this value in-game, on the desktop or anywhere else inside the proper application area.

Speed Related Accuracy Variance

This test shows the sensor's accuracy at different speeds. You can see me doing a fast swipe to the right before I slowly slide the mouse back to its original position. There is no acceleration or deceleration as any displacement is almost entirely caused by human error in this test,

Polling Rate

As for the polling rate, it's quite wonky. It's unstable and has a lot of periodic drops. However, just like with the CPI divergence, other users and reviewers didn't report anything of the sort, so I'm assuming it's my copy only.

Input Lag

There is no input lag below 2,000 CPI; above that, the PMW3360's usual smoothing kicks in, resulting in about +2-3 ms of input lag. Even though this is pretty much a negligible amount, I'd still suggest staying on or below 2,000 CPI if you're a competitive player.

Click Latency

The click latency is roughly +10.5 ms compared to the SteelSeries Ikari, which is considered as the baseline with 0 ms. The control subject was a Logitech G203. The data comes from this thread and my own testings.