I just picked up my Makita 9227c. I am currently using System One, but considering moving away. I currently have Optimum Compound and Polish, along with the System One polish
I like green. It's soft like grey/blue, but has some cut like the white. I use orange, green, black, and red. I personally like the 7.5" mushroom for most work, but use smaller ones for compounding. I'm using a Flex DA, though.