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What little research I have done tells of some issues with used Labradars ports for connecting cables to becoming so loose they need replacing and people have posted claims that Labradar is not that welcoming about repairs to second hand unit bought used I have no way to confirm this as true but it does make one think. Also can there be any software update issues with older Labradar models that can cause problems.
Like to add or should I wait a bit and see if used Labradar prices for them come down any.
I would use it for everything from 22lr to centerfire rifles HG's and archery.
Advice from Labradar unit owners would be of immeasurable help,
It depends on what you need. If you want, at any time, to calculate BC from your chrony, then the LabRadar original is the only game in town. It can be accurately done by hand, or more easily with
https://bc.geladen.ch/labrabaco/labrabaco.html
You'll find that any radar chrony has huge advantages to optical ones: you can't shoot / destroy it; zero dependency on lighting conditions; no need to shut the line down to setup and teardown your chrony; muzzle blast won't affect readings; etc.
I have an original, early-adopter version of the Labradar. Responding to your points:
1) my ports are fine. But I almost never connect a USB cable to it, as I find the AA's to be sufficient.
2) never needed repairs. Don't know how they could tell you aren't the first owner (there's no registration)
3) Software updates are done through an SD Card. Always been easy.
As long as you have recent firmware and phone app versions, the connection to the app (which is a bonus, but not necessary for use) is perfectly reliable. As long as you aim it carefully, in my experience the shot pickup is also perfectly reliable. I have a "RAT" (recoil activated trigger) but do not use it.
The main advantage of the Garmin, Labradar LX, and Andiscan A3 is compact size and easy aiming. But they cost more and will not do BC (edit: it looks like the Labradar LX will soon do BC:
https://www.facebook.com/InfinitionQC/).