I was reading these self-cleaning litterbox reviews and saw the one we have so thought I'd throw my 2 cents in.
We have the ScoopFree automatic self-cleaning litterbox and it's been awesome.
We've had it for over 5 years now and never a problem.
No litterbox stink...and no scooping out clumps of cat poo. VERY happy with it.
Best money I ever spent on a cat product!