Both of the sanding/engraving pens work very well for detail work on 3D prints.
The digital angle gauge looks to be very accurate, got no complaints with it.
The router table insert is kinda shit, it's accurate enough and quite thick so it would seem to be decent quality, but the surface finish is like these typical cnc radial grooves. I'm sure there's a word for it I don't know, but since it's not fully flat but has radially aligned grooves your work pieces don't glide straight over it, instead they get caught on the tool marks. It's still usable but not great.
Miter gauge is alright. Angles are accurate to about a degree which is OK for most stuff, but I drilled through it in the 90 and 45 degree spots so I have it dead accurate there if I want to. It's got a decent weight and size to it.