I notice the links you posted are sponsored by Flushmate.
Flushmate makes the pressure assist for toilets.
They of course feel that their product is the way to go.
The way I see it, all mechanical devices will need work and repairs over time. Some are easy to work on, some not.
At the moment, I have the dual flush Toto Aquia, the 1.6 Ultramax and the Vortens 1.0 pressure assist.
I turn the Vortens pressure assist off when it's not in use. The cartridge doesn't seal all the time, and I hate to listen to the water going down the drain.
[video=youtube;8S9TR9dQQko]http://www.youtube.com/watch?v=8S9TR9dQQko[/video]
A 900 gram rating is nice, but I find that anything over 500 works fine.
Some of the MaP testing I don't understand. I've used the Toto Ultimate elongated at home, rated at 325 grams, and it went a year without plugging.
We replaced it and plugged the Kohler Cimarron, Briggs Vaucity, both that were rated higher. I would like to see them retest with the new methods that they are using now. The Drake was tested with the old method at 900, and it's mainly a two piece version on the one-piece Toto's.
The Ultramax, sharing most of what the Ultimate is, rated out at 700 grams. Plenty good.
The ADA EcoDrake with 1.28 gallons was rated at 900 grams.