@dlowan,
I have four litterboxes and have gone through several thirty liter bags of litter (I use re-cycled paper pellets) since the kittens have arrived!
Sebastian will happily use the Boodaloo in the laundry when he notices it is there, but won't use the boodaloo in the study. I think because the door is heavier and more solid.
I therefore have litter all over the floor and no olfactory protection from the horror of his pooh.
His reaction to being held by the scruff of his neck continues to fascinate and amuse me...it is also useful.
He sort of swoons like a Regency maiden! it takes a couple of seconds to kick in, but then he looks ecstatic, and he just goes completely limp...if he is standing he sinks boneless to whatever he is standing on, with the funniest look of bliss on his face. In that state I have been able to cut his claws with no protest and he will calm down from maximum over the top madness to a semi-coma that lasts for some time after I let him go.
Sadly, Viola is completely immune to this tactic!