Honestly, I've never understood the idea of mixing products of different categories like this. Doing two steps with products specifically designed for those two steps will give you better results than a product that claims to do everything at once. A product that performs multiple functions at once usually sacrifices the quality of results in every step.
Mixing two polishes of similar aggressiveness would be different, because they are both performing nearly identical roles.
white95max, Yeah your probably right. I was kinda hoping for a time saver. I did a black X5 yesterday and finished it with RMG then EX both with a finishing pad. The results were fantastic. This is a regular customer of mine and I haven't used RMG on it in the past. What a differance, the customer was very impressed. Thanks for your advice.