Used my son's Xero C1 Pro first. So impressed had to get one for myself. If you want to shoot longer distances accurately or perform hand load workups then this tool is for you. I utilizes doppler radar to give highly accurate results including speed, avg, ES, and SD and links to an I-phone too.
I own a LabRadar , Caldwell and (accidentally shot) a Competiton Electronics. This is by far the best. Setup is a breeze. Even on a wobbly table that moves when shooting, it picked up the shots. Labradar is good but finicky. Nothings perfect, it did pick up ONE shot out of a hundred from my tripod mounted rifle, 6 feet to to left or unit. App let me ignore that shot, so as not to skew the data. App is simple but works and is way better than others.
I am new to reloading and have never used a chronograph before . It set up ready to use in less than 2mins. Found out I was loading the 9 mm a little hot and wasn't near the max grains so glad I got it . Now I feel more comfortable moving on to rifle rounds.