We started out using the first generaion of the Leo's Loo and had some issues there. Chewy and Smarty Pear were great to work with during the return process. I was hesistant to try out the upgraded version, but I am impressed! The design is much sleeker, the drawer slides in and out a ton smoother, super quiet while cleaning, bigger waste drawer with no clips! Both cats adjusted rather quickly to both boxes. The smell of the box is sometimes noticable, but nothing more than a traditional box. I generally just empty the waste drawer and that solves the issue. My sweet little kitten LOVED the box so much, she would just go and lay inside, ha! I do add a cup or 2 of fresh litter once I empty the waste drawer just so there is enough litter to keep the bladder clean. So far, we are happy with the Leo's Loo Too!