We’ve had the Litter Robot 3 for a few years, and it’s been fine. My gripes were that we had to use clay litter when we wanted to switch to pellets, it’s terrible to take apart and sanitize, the sensors easily get blocked and interrupt cleaning cycles, and our 5 month old Maine coon is already getting too big for it (anticipated) and was brushing against the sides of the globe where waste falls into the drawer during a cleaning cycle (yuck!). Popur solved all these issues. The only problem I’ve had was that the sifting screen never stopped during a cleaning cycle for our 4 pound kitten, even when I tried to hold the screen back, which I heard was a problem. We turn off auto cycle at night and monitor during the day and night change this once our kittens are heavier. We’re also keeping an eye on the liner’s waterproof-ness (also heard problems with this), but so far, our litter has prevented any waste from penetrating deep enough to weigh in on that.
Tl;dr: Would recommend Popur over LR3 to anyone wanting an auto litter box.

Absolutely awesome! Very happy with
The litter box. Can't say enough. Easy, quiet, no oder, cats love it . Highly recommend

The only thing g I wish was different would be it being able to tell if a cat just jumped in and back out or it it actually used the box

The cleaning cycle works great, but there are some other things that would make it an excellent system.

The spreader is very flimsy and its removal requires tools.
The leveling of the litter after cleaning always leaves a gap of missing litter at the front of the box.
The dump box really should be connected to the main unit in some kind of locking mechanism.

Like many others, I was very hesitant to buy — comparing this to the litter robot with extensive research.

This design is MUCH better. The litter robot is so clunky and honestly intimidating to a small cat.

Pros:
- Doesn’t stick to the liner! I was surprised because my cat digs until he reaches the base to pee.
- NO SMELL! Love that there is a separate container. Truly smell proof.
- Open design. It really doesn’t look much different than a regular litter box (if you use open top). Both of my cats used it instantly!
- So easy to clean. Love that I don’t have to pull anything apart.

Cons:
- Like most said, the app is glitchy. I hope the company prioritizes an update.
- I wish the trash bags had draw strings to close it? It’s an awkward design and was annoying to take out without poop spilling
- The small crack between the waste container and litter box itself catches bits and pieces of litter. Easy to clean but still a bit gross.

Tips:
- Set it to manual while your cats adjust! I close the door while it cleans itself so they adjust to the noise of it without being fearful.
- Buy two liners! This allows you to clean the other and let it dry out completely without shutting off the litter box.
- Be conservative with litter. Box says minimum 18 lbs of litter but when I added 10lbs of pellets SOO much was wasted as it wasn’t able to catch it all. Thankfully that was a test run and I was able to dump it back in.

I do think this product deserves 5 stars and I’m very impressed. Although it needs some fixes, it seems like the company listens to these reviews and implements changes quickly. That is what matters most.