To me ROCKETS are as well balanced as I have personally ever heard and of course I wanted them to sound that way. The new 5.1mm micro-dynamic is pretty amazing. While they don't invigorate you like the ASG-2 does they are smooth like a fine aged scotch. You can savor the well balanced sound all day without getting tired of it. I am listening to them now and very happy...
It is rare that a custom and non-custom version of something sounds the same. It has a lot to do with air volume change in the canal and occlusion.
Sounds interesting, can't wait for people to start getting impressions in (I know it probably won't be soon).
As for the custom vs generic, it makes sense that they wouldn't sound the same.