I don't suggest it right now unless you want to be at the very forefront. I have a Lumia 830 and the Lumia 640 and literally the only thing RS2 has right now is a new notification sound, an Action Center message when you first boot up the phone after the update, and more bugs (the latest being that the swipe-from-anywhere-to-close gesture with the Action Center doesn't work right now...you have to use the bar). I'd wait for a little while. You should only install if you just want to find bugs and report to Microsoft.