I have the chance to have one Realme X2 Pro in my hands. So here is a little feedback
About performance : the fluidity is pretty insane. Thanks to the 12Gb RAM I didn't notice any lag during use. The Antutu Benchmark score is also insane and one of the best.
Color OS is pretty cool, not as good as Android stock but the traductions (in french) are good. The battery allow me to last 2 days with a intensive usage (Snapchat, gaming, sms, spotify etc..)
If you have any questions, do not hesitate I'll try to answer them