Just in case there's any doubt..
This is my original Pro, and I can see there's plenty of scope for polishing the enclosure exit. There are some fine lines on the angled exit part, and some in the hole itself, though its much smoother. There's a mounting plastic/rubber insert or collar in front of the driver, butting up to the exit hole.
Looking at the driver, I'm not actually convinced its open at all at the rear, so don't quite get the front/rear balancing part that Flare claim, but whatever.
It would be quite easy to change the cable on it though if it becomes broken..
I'd be fascinated to see what the 2HD looks like inside by comparison. Anyone want to take one apart for us?!