Easy setup! Simple friendly design! 

Pro's: 
Kitty approved... at least by my cat :)
Dust reduction
Less moving parts exposed to the litter 
No more burnt out motors
Runs on demand or manually with a button press

Cons
Fixed delay time before rake (20min)
Must use the manufactures specific litter
Litter box can leak under "normal" operating conditions :( [This review was collected as part of a promotion.]