Good points, Leo. I didn't mean to imply that the Laguna was defective. I believe that it uses the same inverter as my G0766 (which runs on 240 vac). Thanks for the links.
From what I've read, the RF noise suppression capacitors on the inverters cause a small amount of ground current (capacitors from line to ground) and it is very close to the trip point of the GFCI devices. I think that the specs for the Delta inverter are <3.5 ma leakage. The gfci spec is 5 ma +/- 1ma. That is too close of a margin in my opinion. I think that GFCI's are, in general, problematic with heavier-duty electrical tools. They are probably fine for bathrooms and kitchens. There used to be an exception for garages if you used a ceiling drop or had the receptacle high enough or a dedicated circuit. But not any longer. Interestingly, if the person who posted on facebook dragged his new lathe into his living room or bedroom, he wouldn't need a GFCI. But he may have needed a divorce attorney.