I bought a Caroma Caravelle 270 dual-flush in May, 2013 and am not happy at all. It does not wash the sides very good, it splashes up on the seat and cover (especially if toilet paper is not covering everything) and does not always flush the bowl clean. So if you have yellow stuff in the bowl you have that splashing on the seat/cover, if you have brown stuff in the bowl you have that splashing on the seat/cover. What a joke this toilet design is, you often have to dry the seat before sitting and forget about flushing while still sitting there or you will get a wet bum.
I suppose you can't bad-mouth a toilet without getting sued but judging by my experience i find it hard to believe that there are any happy customers using this toilet.
Normal siphon-type toilets mix things up a bit while swirling around and must help in pipe drainage, the Caroma quick splash overflow brainfart can only make drainage worse.
I stumbled on your website a few times while checking out toilets and saw your comment "also good are the Caroma" and wonder how many people you are leading astray with this comment and link.
This has to be the most unsanitary toilet on the planet. Sheesh.