I bought the LM900 at a yard sale 7 years ago for $5!- I've learned a few tricks over the years to get the most out my bargain. This is not a totally maintenance free box - you have to treat it nicely! We have three large Wegies - OMG! Do you know how big the badders are on those babies? Clumps the size of boulders, I tell you! I use scoopaway litter, though it does sometimes get stuck in the corners.  To prevent sticking, I use a light coating of heavy duty silicone spray on the bottom of the (clean)box, rake and track.  Voila, problem solved!  Also, you may have seen the ads for the cart (Litterwo***)to put your littermaid onto.  Being the bargain conscious Mom that I am, I did not spend the $100+ for that cat waste marvel. I put my littermaid on a small(kid)table in the laundry room.  I cut the bottom out of a receptacle and used duct tape to firm up the sides of the receptacle. Next, I used a heavy duty shopping bag (UnderArmor- perfect fit) and folded the top over the receptacle lip. Secure bag to receptacle with duct tape. Cut the bottom of the bag open. Use another thin piece of duct tape across the edge of the box to hold the receptacle in place (only to the edge, not flapped over into the box).  Slide the box so that your new chute hangs off the end and run it into a small trash can lined with a quality Target shopping bag - (Walmart bags rip). All the clumps automatically go into your now huge receptacle, easily emptied by a small child! (Smart thinkin' huh?) Just give it a looksie every couple of days and add more litter, sending aforementioned small child in to replace Target bags. Bonus- you no longer have to buy $12 a box receptacles! For now we're planning eldercare for this box - do I hold the record for longest owned box? When it dies we will replace it with the same model - whatever the price.