What do you like best?
iOS is not the best in everything it does, neither are its competitors. The difference is that it's a stable, secure and privacy-oriented system. As I mentioned in the title, it just works. The fact that not every application gets to the Store means you have more confidence when choosing one. Over the time you'll get used to how it works. Updates are available for a couple of years, which is not necessarily true to Android which is depends on each hardware vendor.
- Application integration when using other iOS / macOS, like Messages or Safari browsing
- User information like passwords, bookmarks, contacts and events are always in sync
- App Store full of applications, both free and paid
- Sharing data across a network
What do you dislike?
- One of the biggest drawbacks is the price. Outside USA the cost of purchasing is usually high as Telcos avoid contracts unless you're dealing as a company and not as a person.
- Because of it's stability, new features are sparse
Recommendations to others considering the product
If using macOS already, don't hesitate. Integration is perfect and it's a system you don't have to worry about anymore.
Something I found in Android using more than one cellphone was that I kept resetting it from time to time (yearly maybe) because it would start to get very slow. This does not happen on iOS and since updates are available for a couple of years, I had 2 phones: an iPhone 3G since it was released until iPhone 7 was released, when I changed again.
What business problems are you solving with the product? What benefits have you realized?
When using an Apple laptop for work, whether developing software or working on design/marketing, having an iOS device like a phone makes all just work when you're roaming or commuting.