Things I liked:Worked as advertised, have been able to register .25 Caliber 20.06 grain pellet at 1406 fps down to a .117 Caliber light weight pellet at 1276 fps without any misreads. A Big Improvement over using the Chrony without the skyscreen lights. Things I would have changed:Perhaps a one piece cloud cover would be worth the additional shipping length. Also, Is seems that the price is high considering it represents half the cost of a good chrony and appears less than top quality. What others should know:For indoor shooting, it is a must. The frustration of trying to get proper lighting sufficient to allow the Chrony to consistently report the speed of a projectile is no easy chore. Thus far, this has been Excellent!