Clarification on how redirect works

I ran across this module and I think it is exactly what I need. However it is not totally clear. I assume that this module takes every path on your site and redirects any domain other than the main to the main on the corresponding page requested. So it works like this:

primary domain = example.com

Page request 1 = https://foobar.com/user/1
301 Redirected to = https://example.com/user/1 (not just example.com)
OR
Page request 2 = http://mydomain.com/content/article1
301 Redirected to = http://example.com/content/article1

It is not made clear that all other domains aren't simply redirected to the home page of the primary domain.

Am I correct on my assumptions having never used this before?

So in short I guess my request is that we simply add some examples to the project page so that it is more clear what this module does and does not do. It should also be clear whether or not this works on multisite installations and whether or not it is compatible with the domain access module.

Thanks!