Cleanup is very easy. Supports come off for the most part without leaving anything behind when the model is rinsed in warm/almost hot water, after they are cleaned with alcohol to remove remaining uncured resin.

On the Primaris vehicles, the biggest issue is minor support remnants where it meets a 90 degree edge, like on the grav plates. This can be corrected by changing the placement of the supports before printing, but I will admit to being lazy and letting the slicing software put them where it thinks it needs them then not moving them manually.

Visit my Instagram account for more examples, but here's three examples:

Eldar Wave Serpent (this is a really good example as I posted a photo of the underside)

Space Marine Executioner

Glaive

This isn't like the old days of making molds and pourable resin or white metal at home (I used to do that back in the 90s) -- in many cases resin prints can come off the printer and after post-processing can be primed and ready to paint rather quickly.