I have used a FloJet portable macerator pump, and a stinky slinky.
I would add that you should get a clear plastic sleeve to mount between the macerator pump and the dump valve. This way, you have more time to react when the pump is empty, as macerators tear themselves up extremely quickly when run dry. You also can tell if the people in your family are eating enough corn, which is important.
After using both, the macerator is tolerable, and I flush it by emptying the black tank, turning the pump off, opening both black/gray valves, letting the water get to a level state, then continuing to dump. This backflush cleans out the black tank without wasting any additional water.
This isn't to say that macerator pumps are useless. I've been at sites where the dump port was higher than the rig, forcing me to either try to park my TT precariously high on blocks, "walk" the stuff via the SS, or perhaps use a blue boy as an intermediary... and the macerator pump made dumping there rather painless.
The best setup (JMHO) is what I've seen on some rigs like Phoenix Cruisers. They have an inbuilt macerator pump... but they have an "emergency" cap and can be dumped via a standard sewage hose.