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The biggest complain I heard is that it need a few minutes to update the atmospheric sensors (temperature, pressure, etc). So it could decrease accuracy if you take it out of a building or vehicle just before the shot.
I really don't know what to say about them, except they work as advertised. As far as taking a few minutes to update once outside the truck, I've never noticed. But then it takes me that long to get set up for a shot anyways. If you have specific questions, please send me a PM or e-mail me at oscarmdog@shaw.ca.
I'll get the e-mails faster than the PM's