I recently lost my Windows 8.1 phone battery, and getting a Windows 10 phone wasn't much more than ordering a battery and having it shipped to the US within the week, plus I needed a phone to communicate.
It's awful. Swipe text behavior is worse: doesn't automatically add spaces it used to (especially near other text), no longer works at all in the browser's URL bar, aggressively gives up on words even after displaying them, and deletes things one character at a time even though the errors with swipe typing are never spelling but instead the wrong word being selected. There are other issues (live tiles are unnecessarily animated without giving information in return, for instance), but I think the way they destroyed typing is the worst impediment.
Windows Phone 8 already made the camera worse by removing the ability to quickly focus and take a photo, but at least swipe text was one improvement over Windows Phone 7's tapping only text behavior.
I'm going to just order the battery and return this phone. Not sure what they were thinking. Maybe they want it to be more like Android, but that's not the point of having a different platform. I'll try to keep WP8 running indefinitely I suppose.
Edit: Swipe text is not as bad in text messaging, but that means there are at least three typing mechanisms (no swipe, bad swipe, good swipe). Very disorienting.