We actually upgraded from the 60 to the 120. We could not be any more pleased. The original 60 had issues with "hair clogs" The 120 with it's new design has eliminated that. We have had it installed for 10 months now and have not had any clogs or issues. We also just ordered and received the dome kit. Our two cats had no issues with the new cover. I guess the only issues is our cats have a tendency to track granules all over. Hopefully with the new dome that will reduce the issue. We also have a rechargeable hand vac that I use only for vacuuming up the granules. Since they are reusable and washable I just dump them from the hand vac into the cat genie and away we go. Once a little extra funds come in we will be ordering a second one for better bathroom use for our cats. Seeing how we will have 3 cats soon.