I can say that I have used all 3 main types of chrono's, the tent, bayonet, and Doppler... the tent style almost requires it be 10'/3m from the barrel to be anything close to accurate which usually ends up getting hit not to mention a real pain setting up... the bayonet is easier but is inaccurate when comparing same load/gun and eviro usually on the highside of velocity, can be used with rimless and even pellet... the Doppler has a pretty steep learning curve between setup and mobile app. The mechanical setup needed tweaking a bit also. If you don't control it from the app, you will need to verify the aim each time you touch it. The real advantage to the Doppler (Labradar) is it's accuracy at 5 different distances out 100 yrs... it will also include kinetic energy based on the weight of the projectile. Included will be the power factor required in many competitions. Pretty much requires a battery pack if you're going to shoot all day.
I'm pretty impressed with my Labradar so far...
texashaag