What is your preferred chronograph and have you used others? I started out with the original PACT chrono years ago until the unit failed beyond repair (returned once for repair after years of use) and currently have a PACT Professional. I'm over sky screens. I have a Magnetospeed, which works great, but doesn't work with all firearm designs. I'm seriously considering the LabRadar unit, pricey but way cool. So what is your preferred chrono?