The Form 3 was acquired as my first foray into resin printing.  There is no doubt on its value proposition - Form Labs is able to serve an entirely different customer as well as compete against Stratasys and 3D Systems.  People often remark on its ~$6k price tag but neglect the fact that comparable systems start at ~$30k - $90k.  

Later, I bought a Nomad 883 Pro for those surfaces requiring higher tolerances and to be able to work with metals and machined plastics.  When I want to achieve a better surface finish I will choose the desktop mill instead of the 3D printer.  I also use it to cut glass and scribe engravings.  The dimensional stability is more repeatable and consistent allowing me to cut a finished shape to accurate dimensions the first time whereas the 3D printer often requires me to re-print for better fitment of an assembly of parts.

The Arduino platform controls all of my electronics.  The biggest advantage is the community that shares code for various applications.  The hardware is convenient but the biggest draw for me is the minimal effort software development.