The only real pain of being in the tanker is an archaic, Cold War era, study/practice that must be reviewed quarterly. Not sure if the -10 guys have stay current on this or not.
The -135 is flying into Afghanistan and doing aeromedical evac.
I'm a young co-pilot that hasn't gone over yet but I was sitting around talking with some of the older guys in the squadron today and they were talking about how they would offload fuel into the KC-10 rather than just dumping, err, adjusting gross weight, when receievers cancel.