I have had a Shooting Chrony Beta Master for about 7 years. Things you should know:
1. differences in ambient light can affect the results, requiring some trial and error in using skyscreens and diffusers
2. open it all the way for use
3. the remote/bench readout is great, will calculate statistics and upload data to a computer
4. the Shooting Chrony is as accurate as any other chronograph if you play the light right