What do you like best?
Fast (when using latest hardware), remarkably stable, top of the line as far as security, intuitive, very easy to use for tech savants and beginners alike. Compatible with mostly every software and device in the apple ecosystem.
Millions and millions of available apps to download or purchase.
Remarkably easy to install, update, backup, restore, format.
Great amount of quality of life features, great multitask performance, very good battery consumption.
Spectacular and fully featured calendar, tasks, notes, reminders suite with great business integration.
What do you dislike?
Planned obsolescence is scandalous, apple has been known and proven to decrease the performance of older devices on purpose causing the OS to run worse over time (once they consider the life cycle of your smartphone has ended).
Consider not upgrading the OS once your iPhone is getting left behind by multiple new models as long as you are already using a stable, fully featured version.
file format implementation is very poor, file types like FLAC, some types of compressed files and several others are absolutely not suported in the slightest.
File transfers between devices are absolutely archaic and tedious. Compatibility with non MAC/Apple devices/files/formats/apps ranges from very poor to nonexistant.
Recommendations to others considering the product
Consider file type and software needs, and the limitations when working together with non Apple software and devices.
What business problems are you solving with the product? What benefits have you realized?
Apple iOS is exclusive but can be configured to fulfill several office needs spectacularly.
From imessage and facetime solving communications needs, to full business email integration, seamless calendar syncing with your company's calendar and a very robust security system, it can become a necessary evil.