My understanding are these systems were made when WE was going through there experimenting, improving and refining stages on the new models. Make a change then build some units to try it. Make another change then build some more units to try the next change, improvement or failure. Some changes I imagine are not as good as anticipated. The machine shop that made these units are left with the machined unsold parts. They assembly these parts to salable 2nds. My feeling is you may not be getting something that works as well or correctly as a factory warranted spec model.
Also, there’s a reason there’s a 2017 Gen 3 Pro! So not only is it a factory 2nd you’re considering, it’s a factory second of the old model!
The warranty and customer service you’d be forfeiting to save a few bucks is another consideration.
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