Well actually, yes it is! I'm currently using tesco's clumping litter (I think it's either the 8 or 10kg bag). Sometimes it's great, however most of the time, even if I fill the trays deeply it's downright awful. It doesn't clump properly hence bits of wee end up covering the tray and the litter ends up smelling after 4 days. Sooo I'm looking to change to something else...but I'm so confused with the options! Am I right in thinking the 'top 3' so to speak are Nature's Gold/Oko Plus/Worlds Best? What is the most cost efficient? I'm currently spending about £14-16 a month on the tesco litter for 2 cats. I'm not so concerned about the tracking, but the one that covers up the smells the best. Thanks in advance.