I was a little hesitant to think my cats would use this box because of the jump through a hold to get into and out of.  However, the cats are definitely use it.  I think they took about 10 minutes to give it a try and have kept using it ever since.  I've been using it about 4 days now and I can definitely tell you that the tracking of litter out of the box has reduced.  The second most annoying thing about litter boxes is the tracking of litter out of it (first is the smell of course) and this litter box does great.  

This loses a star because the plastic feels like it could be a bit sturdier, so I am not sure how long lasting it will be.  The scooper it comes with is also evidence that the plastic isn't that sturdy because if I tried to use it to scoop a big pile of clumped litter, the scooper flexes quite a bit.

All that said, I recommend this litter box.