I've used a 1.0 gallon pressure assist.
I flushes things right down using the Flushmate pressure assist.
Most of the time, the cartridge seals between uses.
It's a little lacking in bowl wash. Most of the water goes through the trapway, not much for the bowl rinse.
In the next room, you notice the flush more than with a gravity setup.
As far as looks go, the Caroma and the Aquia look nicer.
Those have wash down bowls with a 2" flush valve gravity dual flush tank.
The Aquia and the EcoDrake 1.28 leave a cleaner bowl.