Having read all the comments pro and con, I thought I would add my 2 cents worth, even as my cat is sniffing my fingers as I type. He loves to walk around the keyboard and sometimes even sits in front of it.
Anyhow, here goes. We have owned 3 of these over the last 7 years, and have racked up considerable container costs like most owners. Our 2 cats have both used the box without fail and have never gone anywhere else. Our first was an early version which worked great until a hangar fell into it and fouled up the wire to the bar, which at that time was exposed. Despite my best efforts to repair it, I was unable to find the proper wire (VERY flexible) anywhere and LM REFUSED to provide it. My efforts at splicing seemed to come apart easily due to the strain on the wire itself. This model had the best construction, sturdiness, and electronics including plug-in connections instead of the later version’s direct wired/soldered connections. Mechanically, it had the typical problems of the wire exposed and the exposed tracks which were constantly gunked up. Frustrated, we ended up with a newer model instead; what could we do?
Our next model lasted about 3 years (about the same as the first) and started to act up. This problem appeared to be in the electronics. I had saved the old circuits and wiring, but found it totally incompatible with this new model, so again we were frustrated with no alternative but to purchase a new one. This model still had exposed wire and gunk-prone tracks. Both the 1st and 2nd models used the plastic rake with was not easy to remove and was always dirty.
We decided to purchase the Elite Mega with its improved rake, easier cleaning, and most of all, hidden wiring. We have had it for just over a year now and still like the product despite the cost of containers. This new model uses a stronger, quieter motor. The tracks are now hidden, having been moved to above the gears which are also partially hidden, so little or no gunk can reach these parts. The new rake is stainless steel and easily removable for cleaning, although it does seem to sometimes miss pieces the old rake would have caught. Best of all, the old exposed wire to the bar has now been moved inside the side panels and replaced with ribbon cable, a flat, flexible type of wiring used inside computer printers and other machinery where movement and flexibility is required. My experience in the computer world tells me this should last quite a long time. Hopefully, if it needs replacement, LM will provide the part, or perhaps it may be available from a computer supply company.
Regarding the frequency of changing pans, there are other alternatives. One is the Litter Works cabinet/bag system (
http://www.litterworks.com). While the idea is a good one, I see 2 negatives. The first and foremost is the price. This is a spendy proposition, ranging from $50 for a DIY setup where you have to build your own cabinet from the included plans to $160 for the full setup including cabinet. They even have a complete setup which includes a new LM 900! The second negative is "showcasing" your litterbox with a piece of furniture. Most people would rather have their litterbox area hidden than to have it on as big a cabinet as the Litter Works. There are some people who would not mind this cabinet, and I say, "Go for it!" There is also the expense of the replacement bag refills at $14 for 1 to $35 for 3. Still this has its place.
The OTHER alternative is the Slide and Toss (
http://www.slideandtoss.com). This option replaces the LM receptacle with a larger, sturdier plastic box which is meant to hold grocery bags. Most of us probably have an abundance of these, or can get them regularly at the supermarket, so there are no refills to purchase. I have heard some pros and cons on this method here, so look around and read for yourself. We purchased one of these and await delivery so we can give it a shot and report back here. If you have a LM Elite model, the Slide & Toss needs to be modified slightly, but if you tell them when you order, they will do it for you. The Elite LM also needs to be modified, and the instructions for this simple procedure appear on their site as well. If you prefer, they will do this for you, provided you can send them the required parts from your LM, but I am not sure what you will do in the meantime, so I will do it myself.
From my readings here, the biggest problem w/LM appears to be the amount of litter in the pan and the type of litter. We keep ours close to the max fill line so the rake won't have to reach all the way to the bottom. Suggestions from others here say the litter pan needs to be cleaned periodically, and it and the rake should be either coated with mineral oil, or sprayed with pam or a silicone lubricant. I have tried the silicone and the pam and both seem to work well. Obviously, one should let the coating dry before adding litter, or it will stick to the coating. If this should happen on the rake, a few passes later and it will be a non issue.
Overall, I think LM has a great idea, and has improved overall design over the years. They have however, likely in the interest of saving money on manufacturing, made the boxes less sturdy (thinner plastic) and with cheaper electronics using direct wired rather than plug-in connections. (I have not opened our LM Elite Mega, so I am not aware if they have gone back to the better internal wiring method.) The main complaint with LM for me is their lack of providing replacement parts beyond the obvious, like the rake and other visible parts. If they provided replacement innards, DIYers like me could probably keep these things going as long a a Volvo, but then that would NOT bring higher revenues to LM. Nuff said about Big Business!! Happy Catting!
Laz