My experience is that Internet at Sheepscot is good most of the time, but not as good as I get down the street (with Fiber and a different provider.)
Ben's assessment is pretty much spot on. At this time, most of the issues are with wifi and/or cell coverage. Another wifi transmitter near the platform area would probably help, as would one somewhere centrally located in the main shop building.
The reference in the post Graham cited is dated (it's cut & pasted every month) so it could be updated. That said, there are still times where the whole online meeting is less than ideal, and I'm not sure the table-top mic we are using works correctly anymore.