I've been using a PACT for 15 years or so. It's very reliable. I've seen tests that indicate it's not quite as accurate as some other units, especially Oehler and CED. I'm considering a Lab Radar at some point so I don't have to deal with sky screens, but they're pretty expensive.

Do people use chrono's with sky screens in the rain? I've avoided that, and since we get a lot of rain in this area, it limits the when I can use my chrono.