Great!
Was a bit worried as have 2 older cats but the indoor litter tray was driving me bonkers. They took to it after a couple of days, put it initially without lid where the original tray was (bathroom) then brought downstairs near kitchen door for a day, then outside. They have taken to it really well, the lid does fit,you just have to click it in. It is waterproof, has stood some heavy rain with wood pellets inside. I really recommend this, especially if, like me, you’ve had enough of indoor trays!