DE owner here. It turns out that, as Assaf well described, flow meters are inconsistent and they lie. The DE team spent much time (I heard 8 several months) finetuning the firmware to come up with a formula that uses the flow meter and the information about what the pumps are doing to come up with a good flow measurement. The result is that the DE is very good at dispensing the flow you want. "Very good" needs to be defined and it's all relative. I don't have scientific measurements, but if I ask for 1 ml/s for 30 sec the result will be within 5-10% and it's fairly consistent.

The DE can also work with a Bluetooth scale and measure the output and stop the shot at the requested weight. The most recent update finetuned the calculation formula, and we can now get within 0.1-0.2g of the target. I think this is pretty impressive. The formula had to take into consideration the flow. If the shot is flowing at 3ml/s or above, or under 1ml/s the "stop at weight" algorithm needs to be aware of that in order to stop the shot on time. Some pretty smart and talented members assisted with the calculations (since all of the tablet software is available).