Redmi Note phones are great if you can install another Rom on it. They are mediocre/annoying if you can't. Xiaomi software is full of bloat and has some buggy ram/battery optimization features that will screw with apps. The hardware is pretty nice though.
Check XDA Developer forums to see if there is active development for the phone you're interested in. You have to be careful because Xiaomi's naming schemes are horrible, there are so many different versions with similar names. There really isn't any meaning to it.