I initially thought this was the worst smartphone I've ever used. I had to return the first one I bought because it didn't have any service indoors. The replacement wasn't much better. Aside from none of the typical smartphone features not working up to par (poor video recording, apps always freezing, almost no free space), I noticed calls would drop and/or have choppy audio when I wasn't standing still and incoming calls often go straight to voicemail. I would highly advise against buying this phone for any type of user. It's by far the worst phone I've ever had.
Note that I'm coming from an iPhone 5c, Galaxy s8 users may not be as impressed.
Very nice phone, however it does come with some bloatware apps. These are easily removed though.
My only real complaint is you cannot move apps to the card. You'll still have space for plenty of apps, but you can't just go crazy with large games.
Phone is fast and smooth on most apps, but I haven't really tested many games.
Camera is good, however it did seem to have a tiny bit of trouble with focusing speed. Other than that the selfie camera looks a little funny sometimes. Normal camera is really nice.
Haven't really tested audio calls much.
No idea whether it can be rooted.