I will have one of these soon.
It will work on materials other than soft plastics and nylon (e.g., wood, brass, aluminum), so it will be usable for fabricating real parts that can withstand temperatures like southern California car dashboards.
The downside is that the affordable ones are 3 axis, so you can't have overhang in parts. With clever use of zeroing and flipping the part, you can mitigate that somewhat.
I guess if I was willing to cast in metals, a standard 3D printer would be OK. Print in wax, make a mold, and cast. But that seems like a lot more work than its worth for most of the things I want to fab up.