Sensor

All Dark Project mice share the same sensor, which is the PixArt PMW3360. This is one of the best sensors you can go for given it's raw, responsive, and doesn't have any added acceleration. It has some smoothing above 2000 CPI, so it's best used below that value if you're playing on a higher level.

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. Available polling rates are 125, 250, 500, and 1000, which translate to nominal response times of 8 ms, 4 ms, 2 ms, and 1 ms respectively. There are two lift-off distances, marked as 2 and 3 mm. Both values are very low actually as neither tracked from a DVD in height. As for angle snapping, you can turn it on or off in the software, but I highly suggest turning it off (you might have to change the polling rate or CPI setting back and forth in order to refresh this setting).

Paint Test

There is no jitter on the reasonable CPI steps, unwanted angle snapping, or sensor lens rattle.

CPI Divergence

CPI divergence is leaning towards high on the ME2, so if you come from a mouse with a perfect CPI accuracy, you might need to change 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 it while gaming with even 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. As you can see, I couldn't reach it either as even a fast swipe on a huge mouse pad was about 4 m/s for me.

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 is no detectable smoothing on or below the 2000 CPI step. Above 2000 CPI, the PMW3360's smoothing kicks in, which adds about 2–3 ms of input lag to all CPI values above 2000. Such low input lag 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

Click latency is roughly +10.9 ms compared to the SteelSeries Ikari, which is considered as a baseline with 0 ms. The data comes from this thread and my own testings, which was done using the ME2 and a Logitech G100s.