You’ll get 3-4 phone charges out of it, iPhone 11 in my case, and it charges your phone fairly quickly, but it takes forever to charge the battery pack.
The % indicator is questionable and the front plastic scratches easily.
It’s about the same size and weight as an iPhone so it’s useful for taking camping or a weekend away but you wouldn’t want it in your pocket.
Good value for money though, I’ve had it for a month now and I’ve probably cycled the battery 5 or 6 times without issues.