I have tried LandR just to see what it would do. It was with the free mp3 preview. And what it did was make my mix louder and adjusted the eq. I really didn't like what it did to my mix.
However, I received an email from someone at LandR with suggestions on how to make my mix better and would help LandR do it's thing better.
I haven't followed up yet, but plan on it. I'm open on this one. So far it seems they want to work/respond to users.