Love This Product!! I purchased this about a month ago and it is performing beautifully.What others are saying:Other reviewers are saying that the screw holes do not line up. I thought mine didn't either, but with a little shaking of the pieces the holes do line up, the screws sink in half way and then you can screw them in with your fingers (they are big plastic screws so easy to do by hand)."The pieces don't fit together":All the pieces I had fit together. Several of them look very similar though so you have to pay attention and get the right parts in the right place.All in all, the unit I ordered (jumbo version) was easily put together in 30 minutes."the door hinges break"Well they are plastic, so i wouldn't suggest resting your litter box, full of cat waste and heavy litter, on the hinges. If you don't do this, then I don't know how these things could break because there is not very much weight on them. So, don't rest your box on the hinged door when you are pulling the box out to clean the litter. Just grab hold of the box and pull it out without resting it on hinged door."urine leaks through to the floor"Yes this box is not air tight. Some have suggested using a sealant product. What I did was buy an 18 gallon tote from WAl-mart for $5, cut a cat hole in the end of it 7" up from the bottom (and as big as the box would alllow) and now I have a cheap litter box with really REALLY high sides. I've never had a cat go over the edge because it's 15.75 inches high.I find this littler box to be perfect because it is quite large and if I push it all the way to the back of the unit, the cats are required to step out of the litter box and onto the interior surface of the ecoFlex unit instead of immediately stepping out onto the floor. So, I now see ALOT less litter on my floor than I previously had seen. Most of the littler is contained in the unit and I can just use a hand vac for removal.Also with the Walmart tote as a litter box, there are already existing holes at the top of the handles where you can hang an "s" hook, and hang your litter scoop inside of the box. I also love this because then i don't have to store a nasty litter scoop somewhere else, it's contained in the litter box.The reason why I opted for the Walmart tote as opposed to ones I had from Target is that the Walmart tote has less "bends" in the bottom of the box where the litter typically clumps. With less "bends" in the box it is easier to remove the clumpy litter. It always seems to get stuck in the corners....so the less corners I have the better.I also like the colored plastic totes vs. the clear ones because the clear totes seem to be more rigid and more likely to crack. I've never had a rubber tote leak on me and I've used them for years. I suggest a black rubber one for this ecoFlex unit...I used a gray tote and you can see the gray tote through the side windows of the eco flex.Sturdy? I find it to be plenty sturdy to hold a lamp and a few picture frames. It's still even big enough for my cat to lay on top of it. With the jumbo, you also get the storage shelf, I plan on getting a basket to fit in the gap to store stuff.Anyhow, I love this product. I will buy another unit if I can fit one into my laundry room. The decreased litter on the floor is so awesome it would really be nice in the laundry room.hope this helps!!