I have been using a PACT for twenty years this summer. I sent it back to have it checked a couple of years ago and they said that it did not need any recalibration. It takes a few extra minutes to set up, but I normally only chronograph loads once I have found one that groups to my satisfaction.
If I were buying today, I would take a hard look at the Magnetospeed. It would work just as well for my usage, and I wouldn't have to shade the sky screens on bright, sunny summer days. YMMV.
