I run no doors when not mudding, if mudding I have full doors with windows up. If I ever run across some doors, i am going to build some halfdoors. Tube doors would be cool, but they are expensive and I do not have the skills to make my own.
Only bad thing about running no doors is all of the stuff behind the seats likes to fall out. Plus sometimes the police don't like them, but i have never been stopped for it before.