Thanks for your feedback. Just an FYI - I'm not a doctor. The video I found was a physician using the UM3 to print some anatomic models.
I've been 3D printing for a year. Assembled a few Original Prusa i3s (and donated them to our local school system) then moved to the Original Prusa i3 MK2 (bought an aseembled one). I designed some parts for Tesla users to manage their charging cables and have been printing them with my Prusa. I print more than enough to pay for UM3s and, recently, had some issues with the Prusa - perhaps after running through about 75KG of filament. That has been my motivation to consider the UM3.
Plus - I really like the idea of stacking parts and using the water soluble material between pieces and then allowing the printer to do its thing for 24 hours or so. Hopefully that's something that's practical and would allow me to place several parts and print them unattended.
What remains concerning, though, is some stuff I see that makes that more challenging - like being able to detect low materials and pause print jobs. The Anycubic i3 clone does this beautifully.
Otherwise - I think, based upon the comments I'm reading here, I'll take the plunge.
While I'm more than capable of assembling low-cost FDM printers, I'm now looking for a work-horse and want to spend less time worrying about spaghetti jobs being created while I sleep.