I have to make corrections at times, but I can dictate long emails, short text messages, and even use dictation to enter search terms in Safari or to enter text in text fields on webpages. As long as I’m in a not-too-noisy environment, it works quite well. I’ve long used dictation on my iPhone, because I have fat thumbs and find the keyboard too slow to use. But you may be less familiar with iOS’s other dictation feature, the one that lets you talk to your iOS device while it converts your words into text.
You’re probably familiar with using Siri to make calls on your iPhone, as well as to open apps on your iOS device, get information, and set up appointments.