I've managed to do a few useful things with propellor, but it feels a bit rough around the edges to me. It looked at first like the --check and --build options would be useful for checking that my configs would at least compile, but it turns out that --build doesn't even exist and --check just returns without doing anything. Should they just be removed, or do they need more work to finish them?
--check does just what it's supposed to do. This is used during bootstrap to notice if the propellor binary has gotten broken by changes to eg system libraries.
--build seems to have been added without being implemented. But it does seem useful to have a way to simply build propellor so implemented it now.