Royal Flush Plumbing
Both have a dual flush mechanism, allowing the user two options for water usage depending on what they are flushing and how much water might be required. (1.6 and .8 gallons for the caroma and 1.6 and .9 gallons for the Toto. Compare this to older models that typically use between 3 and 7 gallons per flush) Both have what I would descibe as modern lines...mainly an aesthetic based on functionality, not traditional toilet aesthetics and nostalgia. Both have sleek bases that are easy to keep clean...not a lot of nooks and crannies for dust and bathroom scum to collect.
1. It seems like even less water is needed for flushing only urine. (the caroma does better in this area)
2. I recently tiled my bathroom floor ( a couple of years after the caroma was installed.) Unfortunately I did not carfully study the unusual way that the caroma is meant to be installed with screws into the subfloor at the rear. I drilled holes through the tile and subfloor and now there is nothing for the screws to bite into. So my toilet is not solidly attached to anything and therefor rattles around a bit. Real bummer. I prefer tha standard american attachment method.