Sensor

The masterminds behind Dark Project used a wide variety of sensors in their previous mice under the Red Square brand, but there are no compromises when it comes to the ME family; all of its three members use the PixArt PMW3360, which is an absolutely high-end optical sensor. It's as raw and responsive as it gets, and I think it's safe to call it nearly flawless. The reason behind "nearly" is the smoothing above 2000 CPI, which all mice equipped with this sensor seem to have; usually, the amount is negligible, though, and thankfully, that's the case with the ME3 as well.

Now is the time for some sensor specifications: 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 to nominal response times of 8 ms, 4 ms, 2 ms, and 1 ms. The lift-off distance is quite high for this sensor as it tracks above 1 DVD in height and a little more, but is below 2 DVDs (2.4 mm). Unfortunately, I didn't find an option to change this, but I believe a firmware and software update can fix this in the future.

Paint Test

There is no jitter on the reasonable CPI steps, or unwanted angle snapping. There is a small amount of sensor lens rattling, which shouldn't cause many issues, but if it causes any anomalies, the lens should be affixed in place somehow (the Logitech G303 was notorious for this problem on a much higher amplitude, and many users solved it by gluing the lens in place internally).

CPI Divergence

CPI divergence on the ME3 is average. There is really nothing to worry about here; however, if you come from a mouse with pitch-perfect CPI values, you may have to adjust your in-game sensitivity accordingly.

Perfect Control Speed

Perfect control speed (or PCS for short) is insanely high on the PMW3360 at around 6.5 m/s—there is just no way of hitting this while gaming, even with ridiculously low in-game sensitivity. The PCS values don't correlate with the set resolution, which means 400 and 12,000 CPI both hit their limits at about the same value.

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

All polling rate values seem to be nice and stable; there are no suspicious outliers or periodic drops.

Input Lag

There isn't any detectable input lag on or below the 2000 CPI step. Then, as mentioned before, the PMW3360's smoothing kicks in, which adds about +2 ms to all CPI values above 2000. +2 ms is pretty much negligible, but if you're playing competitive multiplayer games at a high level, I would advise against using your mouse with the resolution set above 2000 CPI.

Click Latency

The click latency is roughly +6.5 ms compared to the SteelSeries Ikari, which is considered as a baseline with 0 ms. The data comes from this thread and my own testing. The test was done on the newest (1.0.3) firmware; the initial firmware has about +26 ms click latency, so make sure to update!