I got the device couple of days ago. Tried it at my back yard hitting cage (10x10x10) , every shot was like 10-20 yards short depending on the club. The numbers were consistent though.
Brought it to my home club range and it workes perfectly fine. Distance, shot shape , etc were all good.
I had good lighting in my back yard and the distance between the ball and back net is ~ 10 feet.
The case was built by metal which I am not sure if it has anything to do with the inaccurate numbers.
SW version is 3.7.