So I've been spending more time with my JH13 recently. Still wonderful. My opinion has changed a bit re the bass. I can admit when I'm wrong, you guys are right, it has plenty of bass. However, I still notice what I perceive to be sort of a "hot" top end. Perhaps it's the actual recordings, but cymbals tend to sizzle just a bit more than I would like. This is a minor complaint, but a small flaw nonetheless--just a bit of tizziness/sparkle in the highs. Maybe that's what was making me wish for moar bass at first. You can all start yelling at me now.
Regardless, these are an absolute pleasure. To those of you sending in for refits, you will be happy you did. It's simply not worth it for these things to be uncomfortable. But once they get it right...victory!