Indeed, it's super. OS makes it the most feasible item right now on the lookout. It's smooth, and it will not slack even following 3-4 years settling on it. A wise speculation choice for an innovation.
In all likelihood, common users will either already have experience with iOS on their iPhones, or will pick it up quickly. The UI is generally simple and mostly visual. Power users, on the other hand, may feel constrained by the inherent limitations built-in. Root access, terminal commands, and deep customization are not really to be found here.
Lots of help articles online for just about everything under the sun. I have never personally had to engage Apple's support team to comment on their helpfulness.
iOS is way beyond Android in terms of centralized management. It is way more fleshed out in terms of features, and Android management has all but been abandoned at this point. iOS is still behind Chrome OS, particularly in an educational setting, but there are genuine tradeoffs that might make it a better fit for a given organization, and in fact, we do regularly deploy both iOS and Chrome OS devices.