We use the Breeze system. We have one cat and keep the litter box in our bathroom. My husband bought this system in an effort to persuade me to get a cat. I have to say, it did eliminate all the issues I had with litter boxes. The pad at the bottom really does trap the urine smell, he changes it once a week on trash night. The litter itself is bigger pellets so there is no dust issue and it says in the box mostly (unless the dog goes litter box diving - which is no fault of the litter). We scoop pretty much right away (due to the previously mentioned dog) or as soon as we discover it. And since the litter doesn't really stick to what we're scooping out we can flush the cat waste down and there is no smell left behind.
I have no idea how expensive it is compared to other litter, but for someone who was very hesitant to get a cat because of the litter issue, this has made it a none issue.