I really enjoy an automatic claw to clean my cats box! It scoops the pooh and jumbles up the crystals. The pooh doesnt have to be scooped for 30 days but I do flush it at the end of a day or two because the crystals break down and are flushable. 
I love how the ammonia and urine odor is not detected in the air in my home after the purchase of this system. I can choose to have this system to flush after 5, 10 or 20 minutes  after the cat goes. There is a sensor inside and the claws will scoop after he steps out. This system answers all my problems.