my personal opinion...for what it's worth

l am a huge fan of PETKIT products. The Fresh Element Solo was my first PETKIT purchase and I loved it so much that with my 2nd cat I bit the bullet and purchased the big daddy...The Fresh Element Infinity. I feel like they thought of everything with this one!

1. You can choose a 3 liter or 5 liter capacity. 
2. It has a rotating bowl which keeps food distributed evenly. Weight sensors accurately calibrate the scale and let you know if there's too much or not enough food so that you can make changes to your auto-feed schedule
3. The food door is sealed to keep food fresh for those weekends out of town. 
4. It has a cat lock and a child lock for any of your mischievous little devils.  
5. ONE app for ALL PETKIT devices which I love. It works through wifi and once easily connected, you can schedule as many meals and snacks as you want and in any increments of 1g from 5g to 200g. You will know how much they eat and when.
6. Going out of town? My favorite thing is the ability to go out of town and know that my babies have fresh food for all of their meals and will not overeat the way they do when you leave that one big trough of food for the two days you are gone. It also sports a backup battery in case the power goes out. 

I'm sure that there's details that I'm missing but I've covered my favorites. So if your are on the fence and can handle the slightly hefty price tag, go for it!! I've had the big one for almost a year and the little one has lasted my 3 and still going strong. 

**FYI There are multiple places that you can purchase PETKIT products but a lesson I learned with the litterbox (different review), is if you do not purchase these products directly from PETKIT, it will not be warrantied (unless you add that extra warranty in your Amazon cart at checkout). This may not be a big deal until your $600 litter box gets wet and shorts...:(