I love them.
I bought the Apple one May (’22) last year, and a in late April this year (’23) I ordered a third party one from Belkin, called BoostCharge.
These products are probably hard to get for people who either have a more put together life than I have, or don’t have small children and can just put their phone on a charger and charge it.
If you suddenly realize that you need more battery than your phone has or will be able to charge before you leave or have to go to bed. Or you have a three year old that don’t think your phone belong on the charging stand but closer to you. Or are going somewhere and would like to be able to charge it if you need to. They are awesome.
I’ve used the Apple one a lot over the year I have had it, and the Belkin one I have used a few times since I got it. The big difference between the two is that the Apple one is smaller and has a smaller capacity 1469 mAh (I think, it isn’t disclosed anywhere official), while the Belkin one has capacity of 5000 mAh.
The Apple one charges with lightning and the Belkin one with USB C. Plus that the Apple one doesn’t really have much more to it, there is an indicator that indicates battery levels but only when you attach / detach or plug / unplug a cable. While the Belkin one has a button that I had to click to make it charge the first time. But not since. That you also use to see what the battery level is on four different lights.
It also has a kickstand. It kind of works in portrait orientation, and fairly well in landscape.