I own a CED. I have also shot over many CED's at various competitions as they are the primary chrono for pistol competitions. At a Comp they typically use dual CED's that are placed in line to one another. It is interesting how close these CED's are to one another and then compared to the velocities that I get off of mine (at home) and my buddies (they all have them too), they are very similar.
Also, I will run a rifle load over it, plug the numbers into the phone app and easily shoot to 1k so the velocity must be on. I am sure there are comparable models out there but I have experience with this model dozens of times when you include mine, buddies and various competitions.